trooper /ˈtɹuːpə(ɹ)/noun 6verb 2forms 4 noun6 •A soldier of private rank in cavalry or armor. •(Australia) A mounted policeman. •(US) Ellipsis of state trooper. •A soldier. •(UK) A troopship.She was built by William Denny & Bros. Ltd., and launched in 1939, but went immediately on active service as a trooper. — 1947 •A cavalry horse; a charger. verb2 •To work as a trooper.Maybe I should quit troopering and hire on with Global Harvest. — 2009 •To work steadily at an unpleasant job without complaint.Carrie handed out tools, helped hold a measuring tape, and troopered on where she could, — 2011 formstroopered · troopering · troopers · Troopers