mixed metaphor
Definition - A thought expressed using several metaphors whose combined sense is illogical.

Example -
Rising above it all, he grabbed the bull by the horns and swept it under the rug.

Oxford English Dictionary -
The term's first citation is from 1824:
"We should avoid making two inconsistent metaphors meet on one object. This is what is called mixed metaphor."
(L. Murray Eng. Gram. (ed. 5) I. 493)

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