Canister
. The head (pugilistic term). “To mill his canister” is to break his head. A “canister cap” is a covering for the head, whether hat or cap. A “canister” is a small coffer or box, and the head is the “canister” or coffer of man’s brains.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.