Definitions from Wiktionary (light up)

▸ verb:  (transitive) To illuminate, to bring light to something, to brighten.
▸ verb:  (intransitive) To start to emit light; to become activated as a light source.
▸ verb:  (intransitive, figuratively) To show an increase in activity or a brightening of mood.
▸ verb:  (transitive) To ignite.
▸ verb:  (intransitive) To light a cigarette, pipe, etc.
▸ verb:  (transitive) To make happy.
▸ verb:  (transitive) To introduce (someone to something), to make someone aware of or interested in something; turn on.
▸ verb:  (transitive, slang) To open fire on a target or group of targets, especially with rockets, a flamethrower, etc.
▸ verb:  (chiefly US, transitive, slang) To shock (someone) with a stun gun.
▸ verb:  (chiefly US, transitive, slang) To activate the emergency sirens on a police vehicle in order to pull someone over.
▸ verb:  (transitive, nautical) To loosen, slacken, or ease off.






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