The term 'break down syntactically' can be defined as the process of analyzing a sentence or phrase to determine its structure and meaning. The crossword solution for this term is 'PARSE, ' which is a five-letter word. Parsing is the process of breaking down a sentence into its component parts, such as nouns, verbs, adjectives, and adverbs, in order to understand the meaning of the sentence. Parsing also involves identifying the relationships between the words in the sentence, such as subject-verb agreement and other grammatical rules.