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

Third-person singular simple present indicative form of stumble upon

Third-person singular simple present indicative form of frown upon

To turn and attack a potential attacker

To specify; to mention.

Alternative form of on reflection

(transitive, formal) To take an oath on someone or something.

Synonym of on pain of

Alternative form of dawn on