while the cat is away, the mice will play
Definition:  without supervision, people will do as they please, especially in disregarding or breaking rules
Usage:  as soon as their parents left, the children invited all their friends over – indeed when the cat’s away, the mice will play

SEPEDI
Translation:  ge katse e sa sepetše, magotlo a tlo bapala
Proverb: kgoši ya tloga ye nngwe e a dula

XITSONGA
Translation:  loko ximanga xi fambile, makondlo ma ta tlanga
Proverb: tiko ro pfumala hosi a ri na vuyo

TSHIVENḒA
Translation:  musi tshimange tshi kule, mbevha dzi ḓo tamba
Proverb: khosi ya ṋenga, vhalanda vha a vhusa