sink-or-swim
UK[ˌsɪŋk ɔː ˈswɪm]US[ˌsɪŋk ɔːr ˈswɪm]
adj
Describing a situation in which one must either succeed by one's own efforts or fail completely.
n
A situation or test of this kind.
Etymology
The phrase "sink or swim" is a classic English idiom of Germanic origin, formed from the basic, concrete verbs "sink" (from Old English sincan, meaning to become submerged) and "swim" (from Old English swimman, meaning to move through water). Its logic is rooted in a stark, literal choice presented to a person in water: either keep yourself afloat through effort or drown. By the 17th century, this vivid aquatic metaphor had been fully conventionalized into its modern abstract sense, describing any critical, high-stakes situation where survival or success depends entirely on one's own resourcefulness, with no external assistance. The phrase encapsulates a Darwinian test of self-reliance, where the only options are total failure or successful adaptation.
Analysis
This is a fixed idiomatic phrase composed of the verbs 'sink' and 'swim' joined by the conjunction 'or'. It functions as a compound modifier or noun.
Examples
The company's training program had a sink-or-swim philosophy, throwing new recruits straight into client meetings.
For many small businesses, the first year is a real sink-or-swim experience.
He was given the project with no guidance; it was a classic case of sink or swim.