(grammar) a word or phrase or clause forming part of a larger grammatical construction

an ungrammatical constituent

a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence

(grammar) an expression including a subject and predicate functioning as a part of a complex sentence

a word or phrase used to complete a grammatical construction

a long and intricate and complicated grammatical construction

an expression consisting of one or more words forming a grammatical constituent of a sentence