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:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…