give them an inch and they will take a mile
Definition:  once someone has been given a small amount of freedom, they tend to need more thereafter
Usage:  I borrowed John my laptop to type his assignment, he is currently watching movies; well, give them an inch and they’ll take a mile

SEPEDI
Translation:  ba fe senoko gomme ba nyake go naba
Proverb: o mo fe monwana a nyake letsogo ka moka

XITSONGA
Translation:  va nyike xiphemunyana va ta teka mayele
Proverb: u n’wi nyika rintiho a teka na voko

TSHIVENḒA
Translation:  vha ṋee kupiḓa vha ḓo dzhia na u fhira
Proverb: tsho mphaho luṱanga, kha tshi mphe ṱhanga