The word "会儿" is formed by attaching the colloquial suffix "儿" to the character "会", which here denotes a temporal unit. This suffixation triggers a phonological change where the final sound of "会" (huì) is retroflexed, resulting in the pronunciation "huìr" and indicating an informal reference to a brief period. The construction does not alter the core meaning but modifies the word's register for casual speech.