up- /ʌp/ BrE AmE prefix
1 . making something higher:
to upgrade a job (=make it higher in importance)
2 . [especially in adverbs and adjectives] at or towards the top or beginning of something:
uphill
upriver (=nearer to where the river starts)
3 . [especially in verbs] taking something from its place or turning it upside down:
an uprooted tree
She upended the bucket.
4 . [especially in adjectives and adverbs] at or towards the higher or better part of something:
upmarket (=attracting richer people)
⇨ ↑ down-