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To light in Irish (las): Meaning, Conjugation, Examples

Other uses of ‘las’: switch on · light up · blush

The Irish for to light is las; ag lasadh is lighting.
Updated October 2026Report a mistake

How to say “to light” in Irish

Irish:
las
English:
to light, switch on, light up, blush
Word type:
verb, first-conjugation
Verbal noun:
lasadh (ag lasadh, lighting)
Verbal adjective:
lasta
Pronunciation:
“las”  /l̪ˠasˠ/

What does “las” mean?

“Las” has four alternative meanings. The most common comes first.

to light
To set something burning, such as a fire, a candle or a match.Also: kindle, ignite, set alight.
3 other meanings: switch on or light up or blush
2to switch on
To turn on a light or lamp so it shines.Also: turn on, put on the light.
3to light up
To brighten or glow, as a face or eyes do with emotion.Also: glow, brighten, shine.
4to blush
To go red in the face from embarrassment or anger.Also: flush, redden.

Other Irish verbs for to light: fadaigh (kindle)

“Las” in the different tenses

Every form follows An Caighdeán Oifigiúil.

Aimsir Chaite (Past)

PersonPositiveNegativeQuestion
mé (I)Las méI litNíor las méI did not lightAr las mé?Did I light?
tú (you)Las túYou litNíor las túYou did not lightAr las tú?Did you light?
sé / sí (he / she)Las sé / síHe litNíor las sé / síHe did not lightAr las sé / sí?Did he light?
sinn (we)LasamarWe litNíor lasamarWe did not lightAr lasamar?Did we light?
sibh (you, plural)Las sibhYou litNíor las sibhYou did not lightAr las sibh?Did you light?
siad (they)Las siadThey litNíor las siadThey did not lightAr las siad?Did they light?
saorbhriathar (autonomous)LasadhNíor lasadhAr lasadh?

Aimsir Láithreach (Present)

PersonPositiveNegativeQuestion
mé (I)LasaimI lightNí lasaimI do not lightAn lasaim?Do I light?
tú (you)Lasann túYou lightNí lasann túYou do not lightAn lasann tú?Do you light?
sé / sí (he / she)Lasann sé / síHe lightsNí lasann sé / síHe does not lightAn lasann sé / sí?Does he light?
sinn (we)LasaimidWe lightNí lasaimidWe do not lightAn lasaimid?Do we light?
sibh (you, plural)Lasann sibhYou lightNí lasann sibhYou do not lightAn lasann sibh?Do you light?
siad (they)Lasann siadThey lightNí lasann siadThey do not lightAn lasann siad?Do they light?
saorbhriathar (autonomous)LastarNí lastarAn lastar?

Aimsir Fháistineach (Future)

PersonPositiveNegativeQuestion
mé (I)Lasfaidh méI will lightNí lasfaidh méI will not lightAn lasfaidh mé?Will I light?
tú (you)Lasfaidh túYou will lightNí lasfaidh túYou will not lightAn lasfaidh tú?Will you light?
sé / sí (he / she)Lasfaidh sé / síHe will lightNí lasfaidh sé / síHe will not lightAn lasfaidh sé / sí?Will he light?
sinn (we)LasfaimidWe will lightNí lasfaimidWe will not lightAn lasfaimid?Will we light?
sibh (you, plural)Lasfaidh sibhYou will lightNí lasfaidh sibhYou will not lightAn lasfaidh sibh?Will you light?
siad (they)Lasfaidh siadThey will lightNí lasfaidh siadThey will not lightAn lasfaidh siad?Will they light?
saorbhriathar (autonomous)LasfarNí lasfarAn lasfar?

Modh Coinníollach (Conditional)

PersonPositiveNegativeQuestion
mé (I)LasfainnI would lightNí lasfainnI would not lightAn lasfainn?Would I light?
tú (you)LasfáYou would lightNí lasfáYou would not lightAn lasfá?Would you light?
sé / sí (he / she)Lasfadh sé / síHe would lightNí lasfadh sé / síHe would not lightAn lasfadh sé / sí?Would he light?
sinn (we)LasfaimisWe would lightNí lasfaimisWe would not lightAn lasfaimis?Would we light?
sibh (you, plural)Lasfadh sibhYou would lightNí lasfadh sibhYou would not lightAn lasfadh sibh?Would you light?
siad (they)LasfaidísThey would lightNí lasfaidísThey would not lightAn lasfaidís?Would they light?
saorbhriathar (autonomous)LasfaíNí lasfaíAn lasfaí?

“Las” in a sentence: Irish examples

Past, present, future and conditional, with a negative and a question.

Las sí an choinneal sa chistin.
She lit the candle in the kitchen.
Lasann m'athair an tine gach maidin.
My father lights the fire every morning.
Lasfaidh mé an solas anois.
I'll turn on the light now.
Lasfainn an tine dá mbeadh adhmad againn.
I would light the fire if we had wood.
Níor las an cipín, bhí sé fliuch.
The match didn't light, it was wet.
Ar las tú an solas sa seomra?
Did you turn on the light in the room?

Other verbs in Irish

More everyday Irish verbs to learn next.

To light in Irish: frequently asked questions

What is the Irish for to light?

The Irish for to light is las (pronounced “las”). It is a first-conjugation verb; the verbal noun is lasadh.

What is the verbal noun of las?

The verbal noun of las is lasadh, used after ag for the continuous: ag lasadh (lighting). The verbal adjective is lasta.

How do you say las in the past and the future?

Past: Las mé; negative Níor las mé; question Ar las mé?. Future: Lasfaidh mé; negative Ní lasfaidh mé; question An lasfaidh mé?.

What is the modh coinníollach of las?

The conditional (modh coinníollach) first person is Lasfainn (I would light); negative Ní lasfainn; question An lasfainn?.

Does las have more than one meaning?

Yes. Las can mean to light, to switch on, to light up or to blush, depending on context; the first is the most common.

What is the opposite of 'las' when talking about lights or fires?

Use 'múch': 'Múch an solas' means 'Turn off the light' and 'Múch an tine' means 'Put out the fire'.

Can 'las' be used for a face lighting up?

Yes: 'Las a haghaidh le háthas' means 'Her face lit up with joy', and 'las sé' can also mean 'he blushed'.

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