on last legs

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Related to on last legs: on its last legs

on someone's (or something's) last legs

Fig. for someone or something to be almost worn out or finished. This building is on its last legs. It should be torn down. I feel as if I'm on my last legs. I'm really tired.
See also: last, leg, on

on (one's) last legs

At the end of one's strength or resources; ready to collapse, fail, or die.
See also: last, leg, on