head off
US /hed ɔf/
UK /hed ɔf/

1.
interceptar, impedir, barrar
to prevent someone or something from going in a particular direction by getting in front of them
:
•
The police managed to head off the protestors before they reached the embassy.
A polícia conseguiu interceptar os manifestantes antes que chegassem à embaixada.
•
We need to head off the cattle before they wander too far.
Precisamos interceptar o gado antes que ele se afaste muito.