give somebody an inch

give somebody an ˈinch (and they’ll ˌtake a ˈyard/ˈmile)

(saying) if you say yes to somebody for a small request, they will want much more: I said Joe could borrow my car occasionally, and then he started to borrow it every night! Give him an inch...!
See also: give, inch, somebody
Farlex Partner Idioms Dictionary © Farlex 2017
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The old idiom 'Give somebody an inch and they'll take a mile' springs to mind!
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