› [T] to do a job, task, or duty: perform an operation/task/role As part of the assessment, candidates were asked to perform a group task. The regulator failed to perform his duty to seek an enforcement order. › [I] to do something in a satisfactory or expected way: The threat of redundancies was affecting the team's ability to perform. How well do these savings accounts perform in the longer term?perform well/badly/poorly The company's core brand is performing well. The fund has been the top performing ethical unit trust for five years.