someone's back is turned

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

quand quelqu'un a le dos tourné, quand quelqu'un ne regarde pas

when someone is not looking or paying attention

:
The children started playing pranks as soon as their mother's back was turned.
Les enfants ont commencé à faire des farces dès que leur mère a eu le dos tourné.
He always tries to sneak a cookie when my back is turned.
Il essaie toujours de voler un biscuit quand j'ai le dos tourné.