someone could do something with one hand tied behind his/her back
US /ˈsʌm.wʌn kʊd duː ˈsʌm.θɪŋ wɪð wʌn hænd taɪd bɪˈhaɪnd hɪz hɜːr bæk/
UK /ˈsʌm.wʌn kʊd duː ˈsʌm.θɪŋ wɪð wʌn hænd taɪd bɪˈhaɪnd hɪz hɜːr bæk/

1.
بسهولة تامة, بيد واحدة مقيدة خلف الظهر
to be able to do something very easily, even under difficult circumstances
:
•
He's so skilled, he could do this job with one hand tied behind his back.
إنه ماهر جدًا، يمكنه القيام بهذه المهمة ويداه مقيدتان خلف ظهره.
•
For an experienced chef, making this dish is like doing it with one hand tied behind their back.
بالنسبة لطاهٍ متمرس، إعداد هذا الطبق يشبه القيام به ويداه مقيدتان خلف ظهره.