Definitions for wait up
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Kernerman English Learner's Dictionary
wait up(verb)ɪt
used to tell sb to wait until you get to where they are
Hey, wait up - I'm coming.
wait upɪt
to stay awake at night waiting for sb
His mother was waiting up when he got home.
Wiktionary
wait up(Verb)
To stay awake waiting for somebody to return.
wait up(Verb)
Wait.
Citation
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"wait up." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/wait up>.

