A Long Blade Attached to the Barrel of a Gun
This page is the CodyCross answer for the clue below from Under the sea, Group 21, Puzzle 3.
Question is: A Long Blade Attached to the Barrel of a Gun
and the answer is: BAYONET
Word Meaning:
BAYONET — (military) A blade mounted to the end of a long gun, originally with a handle inserted into the bore, now usually attached underbarrel.
Definitions from Wiktionary.