bargaining chip ˈbargaining ˌchip noun [countable]
something that can be used to your advantage during bargaining:
• Management seemed intent on using potential purchases of new planes as a bargaining chip to win concessions from the pilots.
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bargaining chip UK US noun [C] (UK also bargaining counter)
► something that you offer to give to someone else when you are trying to reach an agreement with them, in order to reach a deal or get an advantage for yourself: »
The Secretary of State announced $100 million of new funding as a new bargaining chip in the negotiations.
Financial and business terms. 2012.