Thin metal blade (4)
I believe the answer is:
foil
This clue could be a double definition.
'thin metal' is the first definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'blade' is the second definition.
(foil is a kind of blade)
Can you help me to learn more?
(Other definitions for foil that I've seen before include "Thin metal sheet; frustrate" , "Fencing weapon; outwit" , "Tharwt with Sword" , "hamper" , "Leaf of metal" .)