cannonEnglishOxford American Thesauruscannon noun mounted gun, field gun, gun, piece of artillery, piece of ordnance; mortar, howitzer; informal big gun; historical carronade, bombard, culverin, falconet, long tom, serpentine; British, historical pom-pom.verb the couple behind almost cannoned into us: collide with, hit, run into, bang into, crash into, smash into, smack into, crack into, ram into, be in collision with, plow into; North American impact with; North American, informal barrel into.