Eggcorn

An eggcorn is the alteration of a phrase through the mishearing or reinterpretation of one or more of its elements, creating a new phrase having a different meaning from the original but which still makes sense and is plausible when used in the same context. The autological word "eggcorn" is itself an eggcorn, derived from acorn. Eggcorns often arise as people attempt to make sense of a stock phrase that uses a term unfamiliar to them, as for example replacing "Alzheimer's disease" with "old-timers' disease", or William Shakespeare's "to the manner born" with "to the manor born".