Lose v. t. [imp. & p. p. Lost p. pr. & vb. n. Losing ]
  1. 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.
  Fair Venus wept the sad disaster
  Of having lost her favorite dove.   --Prior.
  2. 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.
     If the salt hath lost his savor, wherewith shall it be salted?   --Matt. v. 13.
  3. Not to employ; to employ ineffectually; to throw away; to waste; to squander; as, to lose a day; to lose the benefits of instruction.
     The unhappy have but hours, and these they lose.   --Dryden.
  4. To wander from; to miss, so as not to be able to and; to go astray from; as, to lose one's way.
     He hath lost his fellows.   --Shak
  5. To ruin; to destroy; as destroy; as, the ship was lost on the ledge.
     The woman that deliberates is lost.   --Addison.
  6. To be deprived of the view of; to cease to see or know the whereabouts of; as, he lost his companion in the crowd.
  Like following life thro' creatures you dissect,
  You lose it in the moment you detect.   --Pope.
  7. 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.
     He shall in no wise lose his reward.   --Matt. x. 42.
  I fought the battle bravely which I lost,
  And lost it but to Macedonians.   --Dryden.
  8. To cause to part with; to deprive of. [R.]
     How should you go about to lose him a wife he loves with so much passion?   --Sir W. Temple.
  9. To prevent from gaining or obtaining.
     O false heart! thou hadst almost betrayed me to eternal flames, and lost me this glory.   --Baxter.
  To lose ground, to fall behind; to suffer gradual loss or disadvantage.
  To lose heart, to lose courage; to become timid. “The mutineers lost heart.” --Macaulay.
  To lose one's head, to be thrown off one's balance; to lose the use of one's good sense or judgment, through fear, anger, or other emotion.
     In the excitement of such a discovery, many scholars lost their heads.   --Whitney.
  -- To lose one's self. (a) To forget or mistake the bearing of surrounding objects; as, to lose one's self in a great city. (b) To have the perceptive and rational power temporarily suspended; as, we lose ourselves in sleep.
  To lose sight of. (a) To cease to see; as, to lose sight of the land. (b) To overlook; to forget; to fail to perceive; as, he lost sight of the issue.