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Sucking (noun)
An act of sucking.
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Sucking (noun)
A sound or motion that sucks.
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Sucking (adjective)
Still nourished by the mother’s milk, as an infant; suckling.
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Sucking (adjective)
Young and inexperienced.
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Suckling (noun)
An breastfed (being suckled) by its mother.
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Suckling (noun)
A young mammal not yet weaned and still being fed milk by its mother.
Wiktionary