Hard blows? They usually come in pairs (5)
I believe the answer is:
socks
This might be a double definition.
'hard blows?' is the first definition.
(I've seen this before)
'usually come in pairs' is the second definition.
(I've seen this before)
'they' is the link.
This may not be correct. It may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for socks that I've seen before include "Hits - footwear" , "usually come in pairs" , "Foot warmers and wind cones" , "Short hosiery" , "Foot covers" .)