Etymology
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suckle (v.)

c. 1400, perhaps a causative or frequentative form of Middle English suken "to suck" (see suck), but OED suggests instead a back-formation from suckling (though this word is attested only from mid-15c.). Related: Suckled; suckling.

updated on December 26, 2013

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Definitions of suckle from WordNet

suckle (v.)
suck milk from the mother's breasts;
suckle (v.)
give suck to;
The wetnurse suckled the infant
Synonyms: breastfeed / suck / nurse / wet-nurse / lactate / give suck
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.