- upon (prep.)
[upon 词源字典]
- early 12c., from Old English uppan (prep.) "on, upon, up to, against," from up (adv.) + on (prep.); probably influenced by Scandinavian sources such as Old Norse upp a.[upon etymology, upon origin, 英语词源]
- upon (adv.)
- Old English upon; see up (adv.) + on (prep.).