Meaning of "alight"

[Sergio Bernal]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #7 "All Agog", question 1

Unfortunately the cooker overheated and then exploded and so it really wasn't long before the whole house was alight.

(a) in light
(b) on fire
(c) with fire
(d) with light

English Idioms and Expressions, Elementary Level

ESL/EFL Test #7 "All Agog", answer 1

Unfortunately the cooker overheated and then exploded and so it really wasn't long before the whole house was on fire.

Correct answer: (b) on fire
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MY NAME IS SERGIO BERNAL.

I WOULD LIKE TO KNOW:
WHAT IS THE WORD "ALIGHT" MEAN?

Thanks

[Mister Micawber]

.
Alight = burning.
.
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Native English teacher at Mister Micawber's