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.
on (one's) last legs
At the end of one's strength or resources; ready to collapse, fail, or die.