From shakab; a lying down (of dew, or for the sexual act) -- X carnally, copulation, X lay, seed.
see HEBREW shakab
H7902. shekabah
[שְׁכָבָה] noun feminine act of lying, layer; — only construct שִׁכְבַת all P; —
1 act of lying, as accusative of congnate meaning with verb with שׁכב
3: שִׁכְבַתזָֿ֑רַע Leviticus 15:18 a man lies with her a lying of seed (in copulation), compare 19:20; Numbers 5:13; then ( = semen), שִׁכְבַתזָֿ֑רַע תֵּצֵא Leviticus 15:16, 32; 22:4 (+ מִמֶּנּוּ), ׳שׁ ׳ז alone 15:17.
2 layer of dew, הַטָּ֑ל שִׁכְבַת Exodus 16:13-14, (P).