someone's back is turned

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

누군가의 등이 돌려져 있을 때, 누군가가 주의를 기울이지 않을 때

when someone is not looking or paying attention

:
The children started playing pranks as soon as their mother's back was turned.
엄마가 등을 돌리자마자 아이들은 장난을 치기 시작했다.
He always tries to sneak a cookie when my back is turned.
내가 등을 돌리면 그는 항상 몰래 쿠키를 훔치려 해.