Noun
lexical item (plural lexical items)
(semantics) A term—word or a sequence of words—that acts as a unit of meaning, including words, phrases, phrasal verbs and proverbs, exemplified by cat, traffic light, take care of, by-the-way, and don't count your chickens before they hatch.
These words might be better regarded as a peculiar manifestation of morpho-phonemic adaptation of a foreign lexical item. Source: Internet
What this means is that the idiomatic reading is, rather, stored as a single lexical item that is now largely independent of the literal reading. Source: Internet