beat up on someone
phrasal verb with beat verb uk/biːt/ us/biːt/ beat | beaten or beat
US informal
揍，痛打
to hurt someone by hitting or kicking them many times
Kids used to beat up on him after school. 以前那些孩子放学后常常打他。
（不公正地）批评，抨击
to criticize someone unfairly
She didn’t like being beaten up on by the press. 在媒体上受到不公正的抨击，她很不高兴。