O
- oy – (exclamation) Oh!; Oy Gutt - Oh (my) God!
- oy gevalt (אױ גװאַלד) – Oh no! (from Yiddish gvald 'emergency'). Cognate with German Gewalt "force, violence".
- oy vey (אױ װײ) : (exclamation) Oh, woe! (Oh no! – literally, 'Oh, pain!', cf. German "Oh Weh!").
- oy vey iz mir – (exclamation) from אױ װײ איז מיר 'Oh, woe is me!', 'Oh, my suffering
- oytzer – sweetheart, dear (from Hebrew Otzar, treasure)
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