Physically above and in contact with. / Physically directly supported by. / Being followed by another so as to form a series. / At (a prescribed point in time). / On.

(obsolete) by the by; incidentally

plural of sit-upon / (UK, slang, obsolete) Trousers.

plural of sit upon

To attack someone. / To begin an activity; to embark upon a course of action.

Third-person singular simple present indicative form of bring upon

past participle of bring upon

present participle of hit upon

To consider or regard something in a specific manner. / To gaze at something; to look on.

simple past tense and past participle of reckon upon