drop off /ˌdrɑpˈɔf/
脫落,讓…下車,睡著;下降,減少
drop off
v 1: fall or diminish; "The number of students in this course
dropped off after the first test"
2: change from a waking to a sleeping state; "he always falls
asleep during lectures" [syn: fall asleep, dope off, flake
out, drift off, nod off, doze off, drowse off]
[ant: wake up]
3: retreat [syn: fall back, lose, fall behind, recede]
[ant: gain]
4: get worse; "My grades are slipping" [syn: slip, drop away,
fall away]