●be ˌcast ˈdown (by sth) (formal) to be sad or unhappy about sth（因…）沮丧，不愉快◆He is not easily cast down. 让他垂头丧气可不容易。[be + v + adv]▸ˈdowncast ( ˌcast ˈdownless frequent)
adjective
(literary) sad or unhappy沮丧的；不愉快的◆a downcast expression 垂头丧气的表情◆He looked so downcast I took pity on him. 他失魂落魄的样子让我很同情。