Open-up Definition
verb
(intransitive) To open.
Some vacancies have opened up due to retirements.
Open up the door!
Wiktionary
(intransitive) To reveal oneself; to become communicative.
After three hours of questioning, he finally opened up.
Wiktionary
(intransitive) To commence firing weapons.
As the convoy entered the pass, we opened up on them with everything we had.
Wiktionary
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