Darn foot injury from repetitive movement (2,3,3)
I believe the answer is:
to and fro
'from repetitive movement' is the definition.
I can't judge whether this definition defines the answer.
'darn foot injury' is the wordplay.
'injury' indicates anagramming the letters.
'darn'+'foot'='darnfoot'
'darnfoot' is an anagram of 'TO-AND-FRO'.
Can you help me to learn more?
(Other definitions for to and fro that I've seen before include "Shuttle's motion" , "Directions of oscillation" , "From place to place" , "both ways" , "This way and that, back and forth" .)