From thele (the nipple); to suckle, (by implication) to suck -- (give) suck(-ling).
1. transitive, to give the breast, give suck, to suckle: Matthew 24:19; Mark 13:17; Luke 21:23 (Lysias, Aristotle, others; the Sept. for הֵינִיק); μαστοί ἐθήλασαν, Luke 23:29 R G.
2. intransitive, to suck: Matthew 21:16 (Aristotle, Plato, Lucian, others; the Sept. for יָנַק); μαστούς, Luke 11:27; Job 3:12; Song of Solomon 8:1; Joel 2:16; Theocritus, 3:16.