Look at the picture and try to guess the meaning of the idiom 'while the cats away the mice will play.'
when / while the cat's away the mice will play is an expression that describes how people will behave badly or as they like when a supervisor or other authority figure is not present.
Note: It's common to just use the first part of the idiom, "while the cat's away." It's often used in the question form to others to repeat the second part of the idiom, "the mice will play."
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Idiom: While the Cat's Away