pound, n.¹ — Green’s Dictionary of Slang

pound n.¹

[rhy. sl.; pound of lead = head]

the human head.

1933		(con. WWI) F. Richards Old Soldiers Never Die (1964) 116: Calling upon J.C. and his Angels to knock a bit of sense in the Young Soldier’s pound.
1935		Thieves Slang ms list from District Police Training Centre, Ryton-on-Dunsmore, Warwicks 8: Pound: Head.