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/
"someone could do something with one hand tied behind his/her back" picture
1.

sangat mudah, dengan sebelah tangan terikat di belakang

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.
Dia sangat mahir, dia boleh melakukan kerja ini dengan sebelah tangan terikat di belakangnya.
For an experienced chef, making this dish is like doing it with one hand tied behind their back.
Bagi seorang chef berpengalaman, membuat hidangan ini seperti melakukannya dengan sebelah tangan terikat di belakang mereka.