Discontinue supporting (4)
I believe the answer is:
drop
This could be a double definition.
'discontinue' is the first definition.
(dropping is a kind of discontinuing)
'supporting' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for drop that I've seen before include "Spot" , "A little medicine" , "Bit of water" , "small amount of alcohol" , "Sweet; fall" .)