upon

On.

Up and on: in many cases scarcely more than a synonym of on, the force of up being almost or entirely lost. See on, preposition

Upward so as to get or be on: involving motion toward a higher point.

On, in any sense: conveying no notion of height, elevation, rise, or ascent. See on.

See the verbs.

Hereupon; thereupon; onward; on.

On; — used in all the senses of that word, with which it is interchangeable.

to promise; to undertake.

See under Come.

to assume.