arms-length
UK[ˈɑːmzˌlɛŋθ]US[ˈɑːrmzˌlɛŋθ]
adj
Of or relating to an arrangement or relationship in which the parties involved maintain a degree of independence and avoid close involvement, especially to ensure impartiality or legality.
n
A distance sufficient to ensure independence or a lack of close connection.
Morpheme Breakdown
arms
length
arms
limbs
length
measure
Etymology
The term "arms-length" is a vivid metaphorical compound originating from the literal physical distance of an outstretched arm. This concrete image of maintaining a safe or formal physical separation was abstracted into the legal and commercial domain by the late 19th century. It logically evolved to describe transactions or relationships where parties act independently, as if kept physically apart, to prevent conflicts of interest, undue influence, or collusion. The metaphor powerfully encapsulates the principle of maintaining necessary detachment to ensure fairness and objectivity in dealings.
Analysis
Structure: arms (limbs) + length (measure)
arms: From Old English earm (arm, forelimb), from Proto-Germanic armaz, from Proto-Indo-European h₂er- (to fit together). In this compound, it functions as a noun representing the human body part.
length: From Old English lengþu (property of being long), from Proto-Germanic langiþō, derived from langaz (long). In this compound, it functions as a noun representing a linear measurement.
Examples
The two companies, though owned by the same family, conduct all their business on a strictly arms-length basis.
The government agency requires an arms-length review of all contractor bids to avoid favoritism.
She kept her new colleague at an arms-length until she could better assess his trustworthiness.