Fuse together, as metal (4)
I believe the answer is:
weld
(Other definitions for weld that I've seen before include "Join together by heating" , "Join; fuse" , "Join (metals)" , "Join using fusion" , "Type of metal joint" .)
I believe the answer is:
weld
(Other definitions for weld that I've seen before include "Join together by heating" , "Join; fuse" , "Join (metals)" , "Join using fusion" , "Type of metal joint" .)