The coach gave the team a pep talk before the game to boost their confidence.

pep 是名词，意思是"活力、精力"，来自pepper（胡椒）的比喻用法，因为胡椒能让人精神振奋。 talk 是名词，意思是"谈话、讲话"。 pep talk 指为了鼓舞士气、增强信心而进行的激励性谈话，中文常译为"打气讲话"或"动员讲话"。