bargaining chip

US /ˈbɑːrɡənɪŋ tʃɪp/
UK /ˈbɑːrɡənɪŋ tʃɪp/
"bargaining chip" picture
1.

an item or concession that can be used to gain an advantage in negotiations

:
The release of the hostages became a crucial bargaining chip in the peace talks.
His extensive experience serves as a strong bargaining chip for a higher salary.