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Adjective: have-a-go
Usage: informal
  1. (or a person, usually a member of the public) brave in attempting to stop a criminal
    "Brave have-a-go pensioner foils armed robbers"
Verb: have a go
Usage: Brit, informal
  1. Make an attempt at something
    "Why don't you have a go at solving the puzzle?";
    - give it a try, have a bash [Brit, informal]

Derived forms: having a go, has a go, had a go

Type of: assay [archaic], attempt, essay, seek, try