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wait up

wait up

 
See:
wait
part of speech: phrase
definition 1: to delay going to bed in order to await someone or something (often fol. by "for").
I'll be home very late tonight, so don't wait up.I waited up for you until three o'clock in the morning. Where were you?
definition 2: (informal) to stop and wait until another catches up (often fol. by "for").
Wait up! I can't walk as fast as you!Look! Joe's coming. Let's wait up for him.
similar words:
delay, halt, pause, stop