to come into heat: to be gripped by the drive to mate, and so to conceive
This is a rare and very concrete word. It appears in only five verses, and four of them belong to a single scene: Jacob breeding Laban's flocks at the watering troughs. It is the language of a herdsman, naming the season when ewes and she-goats become ready to mate. Behind it lies the ordinary Hebrew verb for being warm (חָמַם), but this form of the word narrowed to bodily heat of one particular kind.
The fifth verse is the surprise. In Psalm 51:5 the psalmist says that his mother did this with him. He had a perfectly good, ordinary word available for becoming pregnant (הָרָה) and did not use it. He reached instead for the word used of animals at the trough, and the effect in Hebrew is deliberately earthy.
English versions handle the two settings differently, which hides the link between them. In Genesis, modern translations say the flocks "were in heat" or "mated", while older ones say they "conceived". In Psalm 51 almost every version says "conceived", so an English reader has no way to hear that the psalmist is borrowing the vocabulary of the sheep pens.
Nuances
How much of the animal breeding sense the psalmist intends when he says his mother conceived him with this verb.
- contestedThe choice of a breeding word is doing real rhetorical work: the psalmist deliberately reaches for the vocabulary used of ewes and she-goats and applies it to his own conception.; M. Dahood, Psalms II: 51-100, AB 17 (Garden City: Doubleday, 1968), 1-11; R. Alter, The Book of Psalms: A Translation with Commentary (New York: Norton, 2007), ad Ps 51; F. Delitzsch, Biblical Commentary on the Psalms, trans. F. Bolton (Edinburgh: T&T Clark, 1871), ad Ps 51:5; J. J. S. Perowne, The Book of Psalms, 6th ed. (London: George Bell, 1886), ad Ps 51:5
- contestedThe verb functions as an intensified way of saying "conceived", part of a poetic pairing that spans the whole of life before birth, and the animal overtone should not be pressed in exposition.; F.-L. Hossfeld and E. Zenger, Psalms 2: A Commentary on Psalms 51-100, Hermeneia (Minneapolis: Fortress, 2005), 12-36; H.-J. Kraus, Psalms 1-59, trans. H. C. Oswald (Minneapolis: Augsburg, 1988), 500-511; M. E. Tate, Psalms 51-100, WBC 20 (Dallas: Word, 1990), 15; J. Goldingay, Psalms Volume 2: Psalms 42-89 (Grand Rapids: Baker Academic, 2007), 121-46