someone's back is turned

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

wenn jemand den Rücken zugewandt hat, wenn jemand nicht aufpasst

when someone is not looking or paying attention

:
The children started playing pranks as soon as their mother's back was turned.
Die Kinder begannen Streiche zu spielen, sobald der Rücken ihrer Mutter zugewandt war.
He always tries to sneak a cookie when my back is turned.
Er versucht immer, einen Keks zu stibitzen, wenn mein Rücken zugewandt ist.