tricher en rendant la monnaie

listen to the pronunciation of tricher en rendant la monnaie
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{v} shortchange
To make disadvantaged by design
To deprive someone of something for which they paid

The elective class was easy, but in the end I was shortchanging myself.

To defraud someone by giving them less change than they ought to be given after a transaction
{f} give less change than is due; cheat, give less than agreed upon, provide less than required