The word "致以" is a classical, formal compound formed by combining the verb "致" (zhì), meaning "to send," "to extend," or "to deliver," with the prepositional particle "以" (yǐ), meaning "with" or "by means of." Together, they create a fixed syntactic structure meaning "to extend (something) to (someone)," where "致" carries the core action of offering, and "以" introduces the object being offered. It is exclusively used in set, elevated phrases—such as "致以问候" (extend greetings), "致以敬意" (pay respects), or "致以歉意" (offer an apology)—acting as a single grammatical unit that elevates the tone and must be followed by a noun object representing the sentiment or formal gesture being conveyed.