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open up

 
See:
open
part of speech: phrase
definition 1: (informal) to speak revealingly, esp. of oneself.
It's hard to know what the child is feeling because he rarely opens up.It's interesting how people sometimes open up to complete strangers when they're traveling on an airplane.
synonyms:
confide
similar words:
burst, confess, speak one's mind, tell
definition 2: to make available, accessible, or possible.
This money opens up a world of opportunities.This new evidence opens up the possibility that he will be released.
definition 3: to begin shooting.
The palace guards suddenly opened up on the crowd.
synonyms:
fire, shoot
definition 4: to open one's door.
Open up! Police!