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Verb: have a go
  1. Make an attempt at something
    - give it a try, have a bash [Brit, informal]
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"

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

Type of: assay, attempt, essay, seek, try