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3. set forth on

set forth on

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set forth on something

 and launch forth on something 

1. Lit. to start out on something, such as a journey. We intend to set forth on our journey very early in the morning. What time will you launch forth on your trip?

2. Fig. to begin presenting a speech or an explanation. As soon as John set forth on his speech, three people walked out. Every time he launches forth on a presentation, it's a half hour before he shuts up.

See also: forth, on, set