eruv

noun, plural er·u·vin [air–oo-vin, er-; Sephardic Hebrew e-roo-veen; Ashkenazic Hebrew ey-roo -vin] /ˈɛər ʊˌvɪn, ˈɛr-; Sephardic Hebrew ɛ ruˈvin; Ashkenazic Hebrew eɪˈrʊ vɪn/, er·uvs. Judaism.

1. any of three rabbinical enactments that ease certain Sabbath restrictions.
2. a line delineating an area in which Orthodox Jews may carry on certain activities normally forbidden on the Sabbath.

noun

1. Judaism an area, circumscribed by a symbolic line, within which certain activities forbidden to Orthodox Jews on the Sabbath are permitted