colloquial reading used in rhoticized phrases like 没法儿 méi​fǎ​r or 想个法儿 xiǎng​ge​fǎ​r, and in the word 法子 fǎ​zi (often pronounced fázi)

A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.