to head smb off – предотвратить, остановить к-л, отвадить
We should head him off before he meets with your mom and tells the truth.
to head off to – отправляться
As children head off to their holiday tours, most of the parents do not feel relaxed.
to bite head off – срывать зло на к-л, пальца в рот не клади
I cannot communicate with her. Every time I try to be polite, she tries to bite my head off.