tapstern.

tapster (n.)"person employed to tap liquors," Old English tæppestre "female tavern-keeper, hostess at an inn, woman employed to tap liquors," fem of tæppere, from tæppa "tap" (see tap (n.1)) + fem. ending -ster. The distinction of gender in the word was lost by 15c., and by 1630s re-feminized tapstress is attested.