talk trash
US /tɔk træʃ/
UK /tɔk træʃ/

1.
험담하다, 도발하다, 자랑하다
to speak badly or insultingly about someone or something, often in a boastful or provocative way
:
•
He always talks trash about his opponents before a game.
그는 경기 전에 항상 상대방을 험담한다.
•
Don't talk trash if you can't back it up with your actions.
행동으로 보여줄 수 없다면 험담하지 마라.