The phrase “thumb in or thumb out” is a slang expression that refers to the way a person holds their thumb when giving a thumbs-up or thumbs-down gesture, typically in the context of evaluating a situation, decision, or performance.
Meaning:
1. Thumb In: Generally implies a positive or favorable opinion; you are “in” favor of something.
2. Thumb Out: Suggests a negative or unfavorable opinion; you are “out” of favor with something.
Origin:
While the exact origin of this specific phrase may not be well-documented, the use of the thumb to indicate approval or disapproval dates back to ancient Rome. The gesture of the thumb has evolved over time and has been represented in various cultures as a sign of either endorsement or rejection. The idiomatic use of “thumb” in contemporary slang reflects this longstanding tradition of using hand gestures to express opinions.
In modern contexts, it can be used humorously or casually to discuss opinions on anything from movies and music to personal decisions or social phenomena. The phrase may also draw on broader themes of inclusion and exclusion, which resonate in various social dynamics.
Overall, “thumb in or thumb out” reflects a playful, yet clear way of conveying approval or disapproval in informal discussions.