Wiktionary
run for the hills
vb. (context idiomatic English) To flee.
Usage examples of "run for the hills".
Keyoke, the old fox, knows our ways well enough by now that he guessed somebody might attempt to run for the hills.
His fellows had run for the hills, having been also panicked by the ship.
If we can't find a way to delay them, we can only run for the hills, or stand and fight.
If you don't have the guts to use that knife, then put your tail between your legs and run for the hills!