When using metaphors in your speeches, mixed metaphors, or combining metaphors from different sources, is a common trait of effective speakers?

A metaphor is a figure of speech that refers, for rhetorical effect, to one thing by mentioning another thing. It may provide clarity or identify hidden similarities between two ideas. Where a simile compares two items, a metaphor directly equates them, and does not use "like" or "as" as does a simile.