to suddenly stop doing something, or suddenly get rid of something or someone

As soon as he enters the boardroom as the new chairman, he will press the ejector button and expel every non-executive director. 一旦他以新任主席的身份进入董事会会议室，他将断然驱逐所有非执行董事。

The manager was ready to hit the ejector button and hand on the job to someone else. 经理已经准备好断然下手，将工作交给其他人。

Keep your finger on the ejector button and be ready to sell at any time. 做好准备断然行事，随时出售。