Definitionen
1.VerbTo open."Some vacancies have opened up due to retirements.; Open up the door!; The executive pay gap is opening up again."
2.VerbTo widen."The corridor gradually opened up into a triangular room."
3.VerbTo bring up (a topic etc.).
4.VerbTo reveal (oneself); to share personal information about oneself; to become communicative."After three hours of questioning, he finally opened up."
5.VerbTo commence a literal or figurative battery of attacks.
To commence firing weapons."As the convoy entered the pass, we opened up on them with everything we had.; The sky has really opened up. I've never seen this much rain!; As soon as she saw him, she just opened up!"
6.VerbTo commence firing weapons."As the convoy entered the pass, we opened up on them with everything we had."
7.VerbTo rain."The sky has really opened up. I've never seen this much rain!"
8.VerbTo berate; to begin shouting at or insulting someone or something."As soon as she saw him, she just opened up!"
9.VerbTo begin running, driving, travelling, etc., at maximum (or faster) speed.
10.VerbSynonym of cheat out (“to face or turn toward the audience more than would be natural”).
11.VerbOf wine: to develop its full flavor a short time after being uncorked and poured.