Copper can switch lanes on the road dangerously
I believe the answer is:
cut in
'switch lanes on the road dangerously' is the definition.
I can't judge whether this definition defines the answer.
'copper can' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'can' becomes 'tin' ('tin' can be a synonym of 'can').
'cu'+'tin'='CUT-IN'
Can you help me to learn more?
(Other definitions for cut in that I've seen before include "Intercept" , "interrupt speaker" , "Start to work" , "Interpose" , "film clip added later" .)