The word **危及 (wēijí)** is a compound verb formed through a logical and sequential combination of two characters: **危 (wēi)**, meaning "danger" or "peril," and **及 (jí)**, meaning "to reach" or "to extend to." Together, they create a syntactical structure where **危** acts as the object or state that is being brought about, and **及** serves as the action that delivers it to a target; thus, the literal sense is "for danger to reach (something)," which semantically fuses into the single transitive verb "to endanger" or "to jeopardize." This formation exemplifies a common pattern in Chinese where a verb (**及**) is preceded by its nominal object (**危**) to create a new verb describing the action of applying that object to something else.