- up- [ʌp] prefix1.) 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-
Dictionary of contemporary English. 2013.