down-

down-
down- /daʊn/ prefix
1. at or towards the bottom or end of something ⇨ up-:
    downstairs
    downriver (=nearer to where it goes into the sea)
2. used to show that something is being made smaller or less important
   OPP  up-:
    to downgrade a job (=make it less important)
    to downsize a company (=reduce the number of jobs in it)
3. used to show that something is bad or negative
   OPP  up-:
    the downside of a situation (=the negative part of it)
    down-market products (=low quality products)