noun, noun or participle which takes 'suru', transitive verb, intransitive verb
Broadly covers back-and-forth exchanges: words, arguments, blows, drinks, etc. Often implies a lively or heated series of actions.
会議では激しい意見の応酬が続いた。
A heated exchange of opinions continued at the meeting.
The game heated up with the back-and-forth between the two teams.
noun, noun or participle which takes 'suru', intransitive verb
Focuses on a sharp or pointed reply, often in a verbal confrontation. Can also mean returning a favor or matching an action.
彼の批判に対して、彼女は冷静に応酬した。
She calmly retorted to his criticism.
相手の挑発にいちいち応酬する必要はない。
There's no need to respond to every provocation from your opponent.