the use in the same expression of two or more metaphors that are incongruous or illogical when combined, as in “The president will put the ship of state on its feet.”.
Origin
1790-1800
Examples from the web for mixed metaphor
Now, there is no silver bullet, to use a mixed metaphor.
The mixed metaphor of a bucket brigade putting out a fire may be a useful way of viewing events.
British Dictionary definitions for mixed metaphor
mixed metaphor
noun
1.
a combination of incongruous metaphors, as when the Nazi jackboots sing their swan song