Give an inch and take a mile

Give an inch and take a mile - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.: "Give an inch and take a mile"

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This applies to churches, governments, children, and men especially.

Give somebody an inch and they'll take a mile.

something that you say which means that if you allow someone to behave badly at all, they will start to behave very badly I'm always wary about making concessions to these people. Give them an inch and they'll take a mile.