blow somebody/something ↔ off phrasal verb American English informal ( see also ↑ blow )
1 . to treat someone or something as unimportant, for example by not meeting someone or not going to an event:
Bud got into trouble for blowing off the meeting.
2 . blow the lid off something to make known something that was secret, especially something involving important or famous people:
Her book blew the lid off the Reagan years.
3 . blow sb’s head off to kill someone by shooting them in the head
4 . blow off steam American English to get rid of anger or energy by doing something SYN let off steam British English :
I went jogging to blow off some steam.