what does it mean when you "open up" to someone?
Open Up
«2. open up - become available; "an opportunity opened up"
open
come up, arise - occur; "A slight unpleasantness arose from this discussion"
3. open up - make available; "This opens up new possibilities"
open
yield, afford, give - be the cause or source of; "He gave me a lot of trouble"; "Our meeting afforded much interesting information"
4. open up - open up an area or prepare a way; "She pioneered a graduate program for women students"
pioneer
innovate, introduce - bring something new to an environment; "A new word processor was introduced"
5. open up - start to operate or function or cause to start operating or functioning; "open a business"
open
establish, found, launch, set up - set up or found; "She set up a literacy program"
6. open up - become open; "The door opened"
open
change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"
unfasten - become undone or untied; "The shoelaces unfastened"
fly open - come open suddenly; "the doors flew open in the stroang gust"
7. open up - talk freely and without inhibition
mouth, speak, talk, verbalise, verbalize, utter - express in speech; "She talks a lot of nonsense"; "This depressed patient does not verbalize"
be quiet, belt up, button up, clam up, keep mum, shut up, close up, dummy up - refuse to talk or stop talking; fall silent; "The children shut up when their father approached"»
(TheFreeDictionary)
open
come up, arise - occur; "A slight unpleasantness arose from this discussion"
3. open up - make available; "This opens up new possibilities"
open
yield, afford, give - be the cause or source of; "He gave me a lot of trouble"; "Our meeting afforded much interesting information"
4. open up - open up an area or prepare a way; "She pioneered a graduate program for women students"
pioneer
innovate, introduce - bring something new to an environment; "A new word processor was introduced"
5. open up - start to operate or function or cause to start operating or functioning; "open a business"
open
establish, found, launch, set up - set up or found; "She set up a literacy program"
6. open up - become open; "The door opened"
open
change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"
unfasten - become undone or untied; "The shoelaces unfastened"
fly open - come open suddenly; "the doors flew open in the stroang gust"
7. open up - talk freely and without inhibition
mouth, speak, talk, verbalise, verbalize, utter - express in speech; "She talks a lot of nonsense"; "This depressed patient does not verbalize"
be quiet, belt up, button up, clam up, keep mum, shut up, close up, dummy up - refuse to talk or stop talking; fall silent; "The children shut up when their father approached"»
(TheFreeDictionary)
To open up to someone means to speak honestly and in-depth to someone, usually about very personal things like emotions. It implies that before you opened up to them, you were more superficial in your dealings with them.