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Phonetics
verb
To illuminate, to bring light to something, to brighten.
To show an increase in activity or a brightening of mood.
Example: He saw Mary and his face lit up.To light a cigarette, pipe etc.
Example: Smoking in this building is not allowed, so I always step outside to light up.To make happy.
To open fire on a target or group of targets.
To shock (someone) with a stun gun.
Phonetics
verb
To loosen, slacken or ease off.
Example: to light up the jib-sheets