When the cat’s away the mice will play
Definition 1 of 1
Pro Tip 1/3Metaphorical Mice
This phrase isn't about animals. It metaphorically compares unsupervised people to 'mice' who misbehave. 
The interns started playing games as soon as their supervisor left — when the cat’s away, the mice will play.
Pro Tip 2/3Unsupervised Freedom
The 'cat' represents an authority figure. Without them, people feel free to do as they please. 
They started a prank war while their manager was away — truly, when the cat’s away, the mice will play.
Pro Tip 3/3Not Just Rule Breaking
The phrase can also imply indulging in activities that aren't usually allowed but aren't necessarily bad. 
The team ordered pizza for lunch when the health-conscious boss was away — when the cat’s away, the mice will play.
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