When/While the cat's away (the mice will play).

something that you say which means when the person in authority is absent, people will not do what they should do.

Do you think it's wise to leave the children alone for so long? You know, while the cat's away...

• cut someone down to size
• cut someone loose
• cut someone some slack
• cut someone to the quick
• cut some slack
• cut something down to size
• cut something loose
• cut teeth
• cut teeth in
• cut teeth in something
• cut the cord
• cut the crap
• Cut the crap!
• cut the Gordian knot
• cut the ground from under feet
• cut the ground from under someone feet
• cut the ground from under someone's feet
• cut the umbilical cord
• cut things fine
• cut through
• cut through like a hot knife through butter
• cut through like a knife through butter
• cut through something
• cut through something like a hot knife through butter
• cut through something like a knife through butter