During the project meeting, the manager digressed and started talking about his weekend fishing trip.

digressed 是动词 digress 的过去式。digress 由前缀 di-（表示"离开"）和词根 gress（来自拉丁语 gradi，意为"走"）组成，字面意思是"走开、偏离"。在语境中表示"偏离主题、跑题"的意思。