to force someone to do, comply with, or submit to something, often using violence;
e.g. They tried to dragoon me into helping them with the task even though it was their responsibility.
(noun)
a member of a military unit/troop that is historically made up of heavily armed soldiers mounted on horses in a European (especially British) army, or broadly a member of the army who is mounted on a horse;
e.g. They saw the first dragoon approaching them on the battlefield.