fail to win; "We lost the battle but we won the war"
suffer the loss of a person through death or removal; "She lost her husband in the war"; "The couple that wanted to adopt the child lost her when the biological parents claimed her"
allow to go out of sight; "The detective lost the man he was shadowing after he had to stop at a red light"
miss from one's possessions; lose sight of; "I've lost my glasses again!"
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 get or obtain; "I lost the opportunity to spend a year abroad"
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"
a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; "the sums of the distances from the foci to any point on an ellipse is constant"
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points