bayonet UK /ˈbeɪənɪt/US /ˌbeɪəˈnɛt/noun 2verb 2forms 5 noun2 •A blade mounted to the end of a long gun, originally with a handle inserted into the bore, now usually attached underbarrel.Fig. 3. Its bayonet, to be fixed by sticking the handle into the muzzle of the musquet. — 1786 •A pin which plays in and out of holes made to receive it, and which thus serves to engage or disengage parts of the machinery. verb2 •To stab with a bayonet. •To compel or drive by the bayonet. formsbayoneted · bayonetted · bayoneting · bayonetting · bayonets