noun
- an enclosing framework on casters or wheels for supporting a baby who is learning to walk.
- a similar device, usually a waist-high four-legged framework of lightweight metal, for use by a weak or disabled person as a support while walking.
- (usually initial capital letter) Informal. Walker hound.
- a person or thing that walks or likes to walk: He’s a great walker.
- Theater Slang. an extra or supernumerary.
- Slang. a musician required by a union contract to be hired and paid full salary even when not needed for performance.