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To light a cigarette, pipe, etc.

Smoking in this building is not allowed, so I always step outside to light up.

Additional definitions for 'light up':

light upTo become light, to brighten.
light upTo bring light to something, to brighten.
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"light up." Phrases.net. STANDS4 LLC, 2017. Web. 19 Nov. 2017. <http://www.phrases.net/phrase/light-up_5088>.

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