Definition of open up in English:

open up

Begin shooting: the enemy artillery had opened up
More example sentences
  • When their entreaties were ignored, an infantry charge was ordered, the artillery opening up behind it.
  • At the same time, American artillery opened up on other, less sensitive rebel strong points.
  • Men who went over-the-top in trenches stood little chance when the enemy opened up with their machine guns.
See parent entry: open

Definition of open up in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards