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bull noun, currency five shillings, a crown piece 19-20; historical. Compare yoop etymology: pre-decimalisation (1971) a coin worth five shillings; perhaps from classical Latin bulla ‘anything of a round, circular nature’; attested by Galloway Tinkler-Gypsies note:

Grose and Egan (1823), Borrow (1874) attest bull as ‘a crown piece’