sister-of-mercy:

Dated or outdated euphemism, more literary than colloquial, for a prostitute . See prostitute for synonyms.
See Also: adelphepothia, Browning sister, bub and sis, Freya, kid sister, pity fuck, sin-twister, sis, siss, sissies, sistie, skin and blister, sobbyist, soror, sororal, warme schwester

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