From Middle English do, from Old English dā ("female deer"), from Proto-Germanic *dajjǭ ("female deer, mother deer"), from Proto-Germanic *dajjaną ("to suckle"), from Proto-Indo-European *dʰeh₁(y)- ("to suck (milk), to suckle").
Cognate with Scots da, dae, Alemannic German te ("doe"), Danish då ("deer, doe"), Sanskrit धेनु ("cow, milk-cow"), Old English dēon ("to suckle"), Old English delu ("teat"). Related also to female, filial, fetus.
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