procliticism
Procliticism refers to a linguistic phenomenon where a short, unstressed word attaches phonologically to a following stressed word. This attached word, known as a proclitic, functions as part of the syllable structure of the word it precedes. Proclitics are typically prepositions, articles, or pronouns. They lose their independent stress and often undergo phonetic changes as a result of this close association. For example, in English, the article "a" in "a book" is often pronounced with less stress than in isolation, and the preposition "to" in "to go" can sound like it's part of the word "go." This merging of sounds is a common feature of many languages.
The concept of procliticism is closely related to encliticism, where a word attaches to the preceding word.