menyusup

Menyusup is an Indonesian and Malay verb meaning to slip into or infiltrate something, typically without being noticed. It can refer to a person or a thing penetrating a barrier, such as a guarded area, an organization, or a system, as well as to liquids or forces seeping through cracks. The action can be physical or metaphorical, used to describe covert entry by individuals or the gradual introduction of influence, ideas, or elements into a structure or environment.

Usage is common in security, crime reports, politics, and journalism, where penyusupan denotes stealth entry or covert influence. For example, a intruder may menyusup ke dalam gedung tanpa izin, or radical ideas may menyusup ke dalam kebijakan pemerintah. In a physical sense, it can describe liquids or gases that permeate through gaps, as in air yang menyusup melalui celah dinding.

Grammar and related forms: the verb can take prepositional phrases such as menyusup ke dalam (into) or menyusup melalui (through). The related noun penyusupan denotes the act or process of infiltration. A closely related synonym is menyelinap, which conveys a similar sense of stealthy movement, though with subtle nuance differences in context and emphasis.

Etymology: the word derives from the Malay/Indonesian root susup meaning to slip through, formed with the prefix me- and infix ny- to produce the active verb.