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Phrase(s): the runt of the litter
1. Lit. the smallest animal born in a litter; the animal in a litter least likely to survive. • No one wanted to buy the runt of the litter, so we kept it. 2. and the runt of the family Fig. the smallest child in the family. • I was the runt of the litter and the butt of all the jokes.
McGrawhill's American Idioms And Phrasal Verbs