The word "合乎" is formed through the combination of the verb "合" (hé), meaning "to conform to" or "to suit," and the classical Chinese preposition "乎" (hū), which functions similarly to "于" (yú), meaning "to" or "in relation to." This structure creates a verb-preposition compound, where "合" provides the core action of matching or aligning, and "乎" introduces the object or standard being conformed to. Thus, "合乎" functions as a transitive verb meaning "to be in accordance with" or "to tally with," and it is typically used in more formal or written contexts, as in phrases like "合乎逻辑" (héhū luójí - to be logical) or "合乎规定" (héhū guīdìng - to comply with regulations).