aggress

[Klimt]

To initiate an attack, war, quarrel, or fight

They arose not from any compelling need to defend or aggress, but to act things out, let off steam, and thereby avoid real, injurious violence.

What is in your stomach is normally enzymes for digestion, stomach acid and related contents, which can all aggress the lining of the esophagus to cause burning and discomfort.

"America . . . guaranteed that no EC state would aggress against another"

[LukeJavan8]

Wars of aggression. usually do not use the word aggress
by itself.