Definition of a piece (or slice) of the action in English:

a piece (or slice) of the action

phrase

informal
  • 1A share in an exciting or profitable enterprise.

    ‘they'd underwrite the cost of the drilling in return for a piece of the action’
    share, portion, bit, cut, quota, percentage
    View synonyms
    1. 1.1US A share in the profits accruing from something.