give him an inch and he will take a yard

podej mu prst a utrhne ti celou ruku
(ekv. rčení) "If you let Mark borrow your tools for this weekend, he'll wind up keeping them for years. Give him an inch and he'll take a yard." (Jestli Markovi dovolíš, aby si půjčil nářadí na víkend, skončí to tak, že si ho nechá na roky. Podej mu prst a utrhne ti celou ruku.)