noun
impudent talk; talking back; getting the last word
Refers to stubbornly talking back or making needless retorts, often when one should stop. Carries a negative nuance of being argumentative or cheeky.
彼は叱られても減らず口を叩く。
He talks back even when he's being scolded.
減らず口を言う前に、自分の間違いを認めなさい。
Before you make a needless retort, admit your own mistake.