●a kick up the ˈbackside ( a kick in the ˈpants) (informal) a shock, strong criticism, etc. which encourages sb to do sth or to behave better鞭策;批评◆What he needs is a good kick up the backside. Then he’d do some work.需要训他一通,他才会干活。NOTE Your backside is the part of the body that you sit on. * backside 指臀部。