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Preposition: upon  u'pón
  1. In contact with, on top of
    "the book upon the table"
    - on
Adjective: up on
  1. Being up to particular standard or level especially in being up to date in knowledge
    "up on the news"
    - abreast, au courant, au fait, apace [N. Amer]

See also: informed

Encyclopedia: Upon

Nearest

unyieldingness
unyoke
unzip
up
up and down
up for
up for grabs
up here
up in arms
up in the air
up on
up quark
up the creek
up the stairs
up to
up to her neck
up to his neck
up to my neck
up to now
up to our necks
up to par