Collides with on the trip: is not badly damaged (4,4)
I believe the answer is:
runs into
'collides with' is the definition.
('run into' can be a synonym of 'collide with')
'on the trip is not badly damaged' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the trip' is an anagram indicator.
'badly damaged' becomes 'run' (I can't explain this - if you can you should believe this answer much more).
'is'+'not'='isnot'
'isnot' anagrammed gives 'sinto'.
'sinto' after 'run' is 'RUNS INTO'.
Can you help me to learn more?
(Other definitions for runs into that I've seen before include "Meets - collides" , "contacts - with 17a" .)