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хлопать по спине stresses
gen.	slap one's back (We were whooping and slapping each other on the back. / We danced and laughed ans slapped each other's backs. (c) 4uzhoj)
хлопать кого-л. по спине
gen.	slap smb. on the back
хлопать кого-либо по спине
Makarov.	slap someone on the back