A buon intenditor poche parole.

English translation: Few words to the good listener.

Idiomatic meaning: A word to the wise is sufficient.

A caval donato non si guarda in bocca.

English translation: Don’t look a gift horse in the mouth.

A chi dai il dito si prende anche il braccio.

English translation: Give them a finger and they’ll take the arm.

Idiomatic meaning: Give them an inch and they’ll take a mile.