upon

A higher-register or more formal alternative to on in most, though not all, prepositional uses.

A vase of flowers stood upon the table. — The painting hangs upon the wall. — All of the responsibility is upon him. — She plays upon a violin (or piano). — The lighthouse that you can see is upon the mainland. — He rested upon his elbows. — Tug upon the rope; push hard upon the door! — I stubbed my toe upon an old tree stump. — He wore old shoes upon his feet. — Born upon the 4th of July. — I have no opinion upon this subject. — They proceeded to arrest someone upon suspicion of bribery. — Upon Jack's entry, William got up to leave. — Before we knew it, the forest was upon us, and the air grew colder and damper. — What will be the effect upon morale? — Have pity or compassion upon him. — They lived upon ten dollars a week. — We ate heaps upon heaps of food. — I depended upon them for assistance. — He affirmed or promised upon his word. — Upon my life, I am innocent. — A curse upon him!

Yesterday, upon the stair / I met a man who wasn’t there / He wasn’t there again today / I wish, I wish he’d go away …