To part with unintentionally or unwillingly, as by accident, misfortune, negligence, penalty, forfeit, etc.; to be deprived of; as, to lose money from one's purse or pocket, or in business or gaming; to lose an arm or a leg by amputation; to lose men in battle.
To cease to have; to possess no longer; to suffer diminution of; as, to lose one's relish for anything; to lose one's health.
To wander from; to miss, so as not to be able to and; to go astray from; as, to lose one's way.
To ruin; to destroy; as destroy; as, the ship was lost on the ledge.
To be deprived of the view of; to cease to see or know the whereabouts of; as, he lost his companion in the crowd.
To fail to obtain or enjoy; to fail to gain or win; hence, to fail to catch with the mind or senses; to miss; as, I lost a part of what he said.
To cause to part with; to deprive of.
fail to keep or to maintain; cease to have, either physically or in an abstract sense; "She lost her purse when she left it unattended on her seat"
fail to win; "We lost the battle but we won the war"
miss from one's possessions; lose sight of; "I've lost my glasses again!"
allow to go out of sight; "The detective lost the man he was shadowing after he had to stop at a red light"
fail to make money in a business; make a loss or fail to profit; "I lost thousands of dollars on that bad investment!"; "The company turned a loss after the first year"
fail to get or obtain; "I lost the opportunity to spend a year abroad"
fail to perceive or to catch with the senses or the mind; "I missed that remark"; "She missed his point"; "We lost part of what he said"
You lose a battle when the Combat Card says that you are defeated or routed, or that the other side wins in a Generals' or Soldiers' Battle.