a person who buys and sells foreign money, shares in companies, etc., for other people

a commodity/insurance/mortgage broker 商品／保险／抵押经纪人

I called my broker for advice about investing in the stock market. 我给我的经纪人打电话咨询股市投资的问题。

a person who talks to opposing sides, especially governments, making arrangements for them or bringing disagreements to an end

During the war Wallas became a power broker in governmental circles. 战争期间华莱士成了政界的权力经纪人。

to arrange something such as a deal, agreement, etc. between two or more groups or countries

The diplomats have failed in their attempts to broker a ceasefire. 外交官们促成停火的尝试已告失败。