Undercovers

Part of speech: adjective

Definitions

1. To act in secret to investigate or gather information while concealing one's true identity
2. a role that involves gathering intelligence while remaining unnoticed
3. engaging in discreet operations often to expose wrongdoing or gather evidence

Etymology: "Undercovers" is the plural form of "undercover," an adjective built from "under" and "cover." The pairing is transparent: "under" plus "cover" describes something done beneath the cover of concealment, out of view. The plural ending suggests the word is being used as a noun or as a noun-like modifier for people working in secret, as in "undercovers" for the officers themselves. The sense of secret work carried on by hidden agents, rather than the literal idea of something placed beneath a covering, is what the compound has come to express. Its parts stay close to their everyday meanings, so the word reads almost like a description of its own purpose. The plural form follows the same pattern as other nouns used in this way, such as "regulars" or "sweethearts."