tail off

US /teɪl ɔf/
UK /teɪl ɔf/
"tail off" picture
1.

减弱, 下降, 逐渐消失

to become smaller or weaker, or to happen less often

:
Sales tend to tail off in the summer months.
夏季销售额往往会下降
The applause began to tail off as the speaker finished.
演讲者结束后,掌声开始减弱