The director decided to do a re-recording of the dialogue as some lines weren't clear enough.

re-recording 是由前缀 re-（表示"重新"）和 recording（录音）组成的复合词。recording 来自动词 record（录制）加上名词后缀 -ing。 re-recording 指"重新录制"，即对已经录制过的内容进行再次录制。