Р243
БИТЬ (УДАРИТЬ/УДАРИТЬ) ПО РУКАМ
old-fash,
collVPsubj:
human,
usu. pi) to come to an agreement,
usu. sealing it by shaking hands
X и Y ударили по рукам - X and Y struck a bargain (made a deal)
(when a handshake accompanies or replaces a spoken agreement) X and Y shook (hands) on it.