0 to start to talk more about yourself and your feelings: --
I've never opened up to anyone like I do to you.
1 (used as an exclamation) let me in; open the door: --
2 to talk about your personal thoughts or feelings: --
I felt I couldn’t open up to anybody.
3 if a new business, office, shop, etc. opens up, or someone opens it up, it starts doing business: --
4 to start business at a particular time and be available to deal with customers: --
5 to make conditions easier for foreign companies to do business in a country: --