A primitive root; to squat or lie out flat, i.e. (specifically) in copulation -- let gender, lie down.
H7250. raba
[רָבַע] verb lie stretched out, lie down (Aramaic form of רָבַץ (q. v.); Late Hebrew רבע usually of copulation, chiefly unnatural; yet compare also Sabean רבע abide, encamp, settle, DHMZMG xxix (1875), 593, Arabic abide, dwell) —
Qal only Infinitive: suffix רִבְעִי Psalm 139:3 my lying down (for repose, opposed to אָרְחִי); elsewhere (H) for copulation (woman with beast) אֹתָהּ לְרִבְעָה Leviticus 20:16, but read אִתָּהּ (suffix of beast) Dr-Wh KöSynt. 226 e, compare Bae Berthol (and Dr2 Samuel 13:14); לְרִבְעָהּ 18:23, read לְרִבְעָה (compl. omitted; see id.).
Hiph`il Imperfect2masculine singular כִּלְאַיִם תַרְבִּיעַ לֹא בְּהֶמְתְּךָ Leviticus 19:19 (H) thy cattle thou shalt not cause to (let) lie down (i.e. breed) in two kinds.