(about a business) not having many customers; not busy （生意）萧条的，清淡的◆a slack period 萧条期◆April is always slack. 四月份往往生意不好。◆slack demand for cars 对汽车的惨淡需求
(about a person) not putting enough care, attention or energy into sth and so not doing it well enough （人）懈怠的◆He's been very slack in his work lately. 他最近对工作十分马虎。