A Dirty Word?

From the Oxford English Dictionary:

A figure of speech in which a name or descriptive word or phrase is transferred to an object or action different from, but analogous to, that to which it is literally applicable; an instance of this, a metaphorical expression. Cf. metonymy n., simile n.

+ meta = In ancient Greek and Hellenistic Greek μετα- is combined chiefly with verbs and verbal derivatives principally to express notions of sharing, action in common, pursuit, quest, and, above all, change (of place, order, condition, or nature)

+phor = + ϕορά carrying ( < the o -grade of the stem of ϕέρειν to bear, carry)

Early use:

a1500  (c1477)  T. Norton Ordinal of Alchemy  Thei made theire bokis to many men ful derk, In poyses, parabols, & in methaphoris alle-so, which to scolers causith peyne and...