mouth off (to/at someone)
phrasal verb with mouth verb [ T ] uk/maʊð/ us/maʊð/
informal disapproving
（跟某人）回嘴，顶嘴
to speak in a rude or offensive way to someone
She's a typical teenager, coming home late at night and mouthing off to her parents. 她是个典型的处于青春期的青少年，深夜才回家，又和父母顶嘴。