1 [intransitive and transitive]
to say something in order to try to prove that what someone said was not true or as a reply to something:
'I could ask the same thing of you,' she countered.
counter an argument/an allegation/a criticism etc
He was determined to counter the bribery allegations.
to do something in order to prevent something bad from happening or to reduce its bad effects:
Exercise helps to counter the effects of stress.