sponsorship money; financial contribution; monetary support
Refers to money provided by a company or organization to support an event, project, or activity, often in exchange for publicity or goodwill.
This event is run with sponsorship money from local businesses.
We asked many companies for cooperation in order to raise sponsorship funds.
協賛 is the act of sponsoring or supporting, while 協賛金 specifically refers to the monetary contribution.
Compound of 協賛 (sponsorship, support) and 金 (money). The exact historical derivation is uncertain, but the term is a straightforward modern compound.