weak as a kitten

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weak as a kitten

Feeble and fragile, as in After that bout with flu she was weak as a kitten. This simile has largely replaced weak as a cat, from the early 1800s.
See also: kitten, weak
References in classic literature ?
No, I'm half-poisoned by Theobald's prescriptions and putrid cigarettes, and as weak as a cat from lying in bed.