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.
The word 'compress' is the opposite of 'expand'.
The opposite of deflate is inflate, or expand.
Increase, expand, develop.
Contract or shrink.
Expand. expand stretch grow enlarge wax grow Ma GIGANTIC MOM
An antonym of downsize could be expand.
uncompress, expand, extend, stretch, increase