to  scratch  one's back
scratch
skræʧ
skrāch
<i>one's</i>
wʌnz
vanz
back
bæk
bāk

Définition et signification de « scratch one's back » en anglais

to scratch one's back
01

to offer someone help, usually while expecting them a favor in exchange 

to [scratch] {one's} back definition and meaning
idiome
informel
Exemples
He agreed to scratch the mayor's back, hoping the mayor would support his project later. 
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