Firmly attach (5)
I believe the answer is:
affix
(Other definitions for affix that I've seen before include "Join" , "Fasten (to something)" , "Glue" , "Attach" , "Append" .)
I believe the answer is:
affix
(Other definitions for affix that I've seen before include "Join" , "Fasten (to something)" , "Glue" , "Attach" , "Append" .)