[, ; ]a decrease in the level or amount of sth, especially after being high for a long time下降；减少；衰弱◆The industry has seen a sharp drop-off in sales.这一行业的销售量急剧下降。◆We are expecting some drop-off in demand.我们预计需求量会出现少许下降。➡drop off at drop verb⨁a massive / sharp / slight / steep drop-off大规模／急剧／轻微／突然下降 [] the act of delivering sth/sb to a particular place; the place where sb/sth is delivered or the thing or person that is delivered把（某物／某人）放下；下客处；卸货地◆They've increased the size of the trucks and the number of drop-offs that drivers have to make.他们增加了卡车的载重量以及司机必须卸货的次数。➡pickup