upon
[preposition]
Synonyms: over, about, on, with

[TahlilGaran] English Synonym Dictionary ▲

up‧on S2 W1 /əˈpɒn $ əˈpɑːn/ preposition formal
[Date: 1100-1200; Origin: up + on]

1. used to mean ‘on’ or ‘onto’:
an honour bestowed upon the association
We are completely dependent upon your help.
Brandon threw him upon the ground.

2. if a time or event is upon you, it is about to happen:
Winter is almost upon us.

3. layer upon layer/mile upon mile etc used to emphasize that there are a lot of layers, miles etc:
mile upon mile of golden sand
⇒ once upon a time at once¹(14), ⇒ take it upon yourself to do something at take¹(27)

[TahlilGaran] Dictionary of Contemporary English ▲

upon
əˈpɔn
{v. phr.} To latch onto.
Whenever Herb is in a romantic mood, Irene seizes on it and starts talking about marriage, which is not what Herb had in mind.

{v. phr.} To be determined about something.
Tow is set upon leaving his Chicago job for Tokyo, Japan, although he speaks only English.

{v. phr.} To draw constantly nearer with great speed and force.
The police cars were bearing down on the bank robbers' get-away car.

[TahlilGaran] English Idioms Dictionary ▲