1. responded to an argument, criticism, or attack with an opposing argument or action
Usage: past tense of counter
2. acted against something in order to reduce its force or neutralize it
Usage: past tense of counter

Examples

• She countered his criticism with facts and evidence.
• The politician countered the accusations during the debate.
• He countered her move in chess with a brilliant strategy.
• The medicine countered the effects of the poison.
• They countered the enemy’s attack with a defensive strategy.
• The company countered the negative publicity with a new campaign.