Bill never did his homework and the teacher flunked him.

The word underlined is a slang expression meaning ‘to fail’, or ‘not be given a passing grade’ for an assignment or class in school.

[比爾從不做家課，老師把他給死當了。]

在美語口語中 flunk 作「不及物動詞」用，指學生考試失敗、不及格；作「及物動詞」用時，則指老師給學生不及格分數。