Definition of up- prefix from the Oxford Advanced Learner's Dictionary

 

up-

 prefix
prefix
BrE BrE//ʌp//
 
; NAmE NAmE//ʌp//
 
 
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(in adjectives, verbs and related nouns) higher; upwards; towards the top of something upland upturned upgrade uphill More Like This Prefixes a-, ante-, anti-, be-, co-, de-, demi-, dis-, en-, ex-, extra-, hyper-, hypo-, il-, in-, infra-, inter-, intra-, mis-, non-, off-, oft-, out-, over-, para-, post-, pre-, pro-, re-, retro-, semi-, sub-, trans-, ultra-, un-, under-, up-See worksheet.
See the Oxford Advanced American Dictionary entry: up-