down- /daʊn/ BrE AmE 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)