名詞 slip-up:

1. a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.
   同義詞：slip, miscue, parapraxis

動詞 slip-up:

1. make an error
   同義詞：stumble, slip up, trip up

1. Leaving his name off the list was a bad slip-up.
   名單上沒有他的名字是個嚴(yán)重的疏忽。