pat someone on the back

US /pæt ˈsʌm.wʌn ɑːn ðə bæk/
UK /pæt ˈsʌm.wʌn ɑːn ðə bæk/
"pat someone on the back" picture
1.

to praise someone for doing something good

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The coach patted his team on the back for their excellent performance.
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Don't just pat yourself on the back; there's still a lot of work to do.
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a pat on the backpatbe on someone's backsomeone's back is turnedbehind someone's backstab someone in the backcover someone's back