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si, sy, syae, syce noun, currency a sixpence 20; historical. Compare suchira, syeboord, boord, saus etymology: pre-decimalization (1971), a coin worth six old pennies; possibly an abbreviation of Romany suchira, shehaury, shohorry with the same meaning; form sy attested by Galloway Tinkler-Gypsies and Shelta; form si collected by RD; forms si and syce attested by BS in TDITA note:

Grose and Egan (1823) attest a form sice which is and the above is perhaps an abbreviated form of this.