enter upon

transitive verb

1. to come or go in or into
2. to force a way into; penetrate; pierce: the bullet entered his body
3. to put into; insert
4. to write down in a record, list, diary, etc.; make an entry of
5. 1. to list as a participant in a competition, race, etc.
   2. to become a participant in (a contest)
6. to join; become a part or member of (a political party, school, club, etc.)
7. to get (a person, etc.) admitted
8. to start upon; begin: to enter a career
9. to present for consideration; submit, esp. formally or officially: to enter a protest
10. to register (a ship or cargo) at a customhouse
11. to input (data, a password, etc.) into a computer or other electronic device
12. Law
    1. to place on record before a court
    2. to go upon or into (land or property) and take possession
    3. ☆ to file a claim for (a parcel of public land)

intransitive verb

1. to come or go into some place; make an entrance: also used as a stage direction meaning “he (or she) comes, or they come, on stage”
2. to pierce; penetrate