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Phrase(s): suck someone’s hind tit
Sl. to be forced to do someone’s bidding no matter how unpleasant or impossible. (Fig. on the idea of the last of a litter of animals to get its mother’s milk. Potentially offensive. Use only with discretion.) • What am I supposed to do—suck his hind tit? • She acts like everybody has to suck her hind tit to keep their jobs.
McGrawhill's American Idioms And Phrasal Verbs