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O

Olam HaBah The World to Come

oleh (pl. olim) lit.=ascender: immigrant to Israel

Omer period of 49 days between the second night of Pesach and the first night of Shavuot; first 33 are period of national mourning

oneg party, usu. on Shabbat

(The) O.U. The Orthodox Union (full name: Union of Orthodox Jewish Congregations of America), or its kashrut insignia.
see: kosher symbols

Oy, gevalt "Oh, drat!"; "Quick, help!"

Oy, gottenyu "Oh, G-d!"

Oy, vey lit.=(it) hurts: "Oh, no!"

Oy, vey is mir "Oh, woe is me."

oysvorf (Yid.) layabout, ne'er-do-well