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

英語での「 scratch one's back」の定義と意味

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
慣用句
くだけた
He agreed to scratch the mayor's back, hoping the mayor would support his project later. 
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