prostitute's pupil

English

Etymology

From the notional similarity in behaviour: both (the pupil and prostitute) accommodate but do not react. In the case of the pupil, it is reacting to light; and in the case of the latter, it is to the client.

Noun

prostitute's pupil (plural prostitute's pupils)

1. (medicine, slang) Argyll Robertson pupil, a characteristic sign in syphilitic eye disease.