From Longman Dictionary of Contemporary Englishenter upon something phrasal verb formalTAKE PART/BE INVOLVEDto start doing something or being involved in it countries newly entering upon industrialization → enter→ See Verb table
Examples from the Corpus
enter upon • Meanwhile, the siege of Antwerp was entered upon.• So much can depend on the kind of expectation on which an arrangement is entered upon.• In May 1979, partly out of desperation, we entered upon a great experiment.• The intention of the parties entering upon a partnership is seen to be of paramount importance.• Then had entered upon a wise and just rule, marked by church endowments and by pilgrimage.• He enters upon long digressions, and his illustrative anecdotes expand into separate episodes.• Lord Reid stated that jurisdiction in a narrow sense meant only that the tribunal be entitled to enter upon the inquiry.• Fortunately, in 1989, a new, ultrasensitive high-tech search program entered upon the scene. 