19.to blow hot and cold犹豫不决；反复无常
The government keeps blowing hot and cold on green taxes.政府对是否征收环境税举棋不定。
She's still blowing hot and cold on whether to go with us.她对是否跟我们一起走仍犹豫不决。
20.to blow itself out
gale, storm +停息；平息；停止；减弱
The storm had blown itself out by the time we went to bed.我们上床睡觉时暴风雨已经停息了。