With this article we try to show the importance of the context and the emotions to decode the meaning of idioms principally constructed by means of metaphors centred on parts of the human body. From the theory of Conceptual Integration by Fauconnier and Turner we will show that we can explain that in certain situations we activate the literal original sense of the idiom decoding each of its units separately instead of, as it happens normally, treating it in a block to accede to its metaphorical or figurative meaning.

Idioms, metaphor, Cognitive Linguistics, Blending Theory, emotions.