Word Study
prosit
CIDE DICTIONARY
prosit, interj. [L., 3d pers. sing. subj. present of prodesse to do good; pro for + esse to be.].
Lit., may it do (you) good; -- a salutation used in well wishing, esp. among Germans, as in drinking healths; -- also used in the contracted form prost . [Webster 1913 Suppl.]
OXFORD DICTIONARY
prosit, int. an expression used in drinking a person's health etc.
Etymology
G f. L, = may it benefit
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