1. explain exactly or clearly 闡明
The President set forth his plans in a television talk. 總統在電視講話中闡明了他的計劃。
She willingly set forth her opi nions. 她主動提出了她的意見。
2. start to go somewhere 出發
The troops set forth on their tenmile hike early. 部隊一大早就進行10英裡的行軍去了。