Responded to an argument or attack with an opposing argument, action, or response.
From Old French 'contre' meaning 'against,' combined with '-ed' to form the past tense. The word implies moving against something, like countering a chess move with your own move.
The prefix 'counter-' is incredibly productive in English—we use it to describe opposition in everything from arguments to kitchen tops (countertops literally go against, or on top of, the wall), showing how one Latin root can shape dozens of modern meanings.
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