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Wiktionary
head for the hills

vb. 1 To travel to a higher elevation, especially to a rural region on vacation. 2 (context idiomatic English) To go to a safe place; to seek refuge; to flee.

WordNet
head for the hills

v. flee; take to one's heels; cut and run; "If you see this man, run!"; "The burglars escaped before the police showed up" [syn: run, scarper, turn tail, lam, run away, hightail it, bunk, take to the woods, escape, fly the coop, break away]