The word 'compress' is the opposite of 'expand'.
"EXPAND"
Contract or shrink.
An antonym of downsize could be expand.
The opposite of expand is contract (in some uses, to shrink).For expand (increase), the opposite can be reduce or decrease.For expand (widen), the opposite would be to narrow.For expand (inflate) the opposite would be to deflate.
uncompress, expand, extend, stretch, increase
The opposite of expand is contract (in some uses, to shrink).For expand (increase), the opposite can be reduce or decrease.For expand (widen), the opposite would be to narrow.For expand (inflate) the opposite would be to deflate.
Some antonyms(opposites) include:enlarge, expand, free, let go , release.
I think you need to expand upon the definition of this word before an antonym can be provided.
The opposite of deflate is inflate, or expand.
contract
contract