① run off on sb.取的含义就是run off,＝ to run away; elope.这里就是躲避,逃离某人的意思. ② run up on sb.这个是俚语,有3个含义： a) to confront someone with hostility,带有敌意的和某人冲突或对质. b) to jump,or momentarily attain a hidden position and then compromise your position with bad intent.就是某人从暗处,带着不轨目的,突然出现让你无所遁形. c) To try to make a move or have s·e·x with somebody.这个就更直接了,试图和某人有亲密行为.
