Rush to get US code (3)
I believe the answer is:
zip
I believe this is a double definition.
'rush' is the first definition.
(I know that rush is a more specific form of run)
'code' is the second definition.
(I know that ZIP is a type of code)
'to get us' acts as a link.
(Other definitions for zip that I've seen before include "Compress file for storage on disk < (or flash" , "Toothed fastener" , "required in open-and-shut case?" , "Locking device with two toothed edges and a sliding tab" , "Energy or clothes fastener" .)