someone's back is turned

US /ˈsʌm.wʌnz bæk ɪz tɜrnd/
UK /ˈsʌm.wʌnz bæk ɪz tɜrnd/
"someone's back is turned" picture
1.

when someone is not looking or paying attention

:
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The children started playing pranks as soon as their mother's back was turned.
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He always tries to sneak a cookie when my back is turned.
:
turn backbe on someone's backturn the clock backturn someone's headstab someone in the backcover someone's backpat someone on the back