give (one) an inch and (one) will take a mile

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give (one) an inch and (one) will take a mile

A phrase used to describe a situation in which one makes concessions for another who then takes advantage of them. If you let the kids stay up later on the weekends, they'll want to do it all the time. Give them an inch and they'll take a mile.
See also: and, give, inch, mile, take, will