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general::
Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs