open%20up

verb

1. 1

   To open.

   “Open up the door!”

2. 2

   To reveal oneself; to share personal information about oneself; to become communicative.

   “After three hours of questioning, he finally opened up.”

3. 3

   To commence firing weapons.

   “As the convoy entered the pass, we opened up on them with everything we had.”

4. 4

   (of the sky) To rain.

   “The sky has really opened up. I've never seen this much rain!”

5. 5

   To begin running, driving, travelling, etc., at maximum speed.