head off

British  

verb

1. to intercept and force to change direction

   to head off the stampede

2. to prevent or forestall (something that is likely to happen)

3. to depart or set out

   to head off to school

---

head off Idioms  

1. Block the progress or completion of; also, intercept. For example, They worked round the clock to head off the flu epidemic, or Try to head him off before he gets home. [First half of 1800s] This expression gave rise to head someone off at the pass, which in Western films meant “to block someone at a mountain pass.” It then became a general colloquialism for intercepting someone, as in Jim is going to the boss's office—let's head him off at the pass.

---

Example Sentences

"So you pay the amount. An hour later, they say it’ll be in your account. But it's not there. And you cry, you scream your head off."

From Barron's • Jun. 5, 2026

I do not envy anyone who has found themselves in a position where they feel the need to preemptively head off charges of idolatry.

From Slate • Jun. 2, 2026

“I had to prop myself against this foam spike in front of my colleagues and friends, and then have Winona come up and chop my head off, which was incredible,” Bower says.

From Los Angeles Times • Jun. 1, 2026

They'll take it and head off in reasonable heart.

From BBC • May 30, 2026

The tone of my voice makes Malia stop crying for a minute, and she lifts her head off Mom’s shoulder to look at me.

From "A Soft Place to Land" by Janae Marks