solitary vice

plural solitary vices

1. obsoleteMasturbation.

   Boys come to our school from many different classes of preparatory and secondary schools. Almost every such school seems to possess a few boys who delight to initiate younger boys into sexual knowledge, and usually into knowledge of solitary vice.

   1919, Mary Scharlieb, Frederick Arthur Sibly, Youth and Sex: Dangers and Safeguards for Girls and Boys

   1 more example

   The vice consists in any excitement of the genital organs produced otherwise than in the natural way. It is known by the terms, self-pollution, self-abuse, masturbation, onanism, manustupration, voluntary pollution, solitary or secret vice, and other names sufficiently explanatory.

   [1881, John Harvey Kellogg, Plain Facts for Old and Young

   Synonyms: secret vice, beat one's meat, celebrating Palm Sunday, choking the chicken, ham shank, hand shandy, Hand Solo, ipsation