Lose (verb)

1. To misplace or be unable to find something.
2. To fail to win or be defeated in a competition or conflict.
3. To cease to have or retain possession of something.
4. To cease to function or be effective.
5. To have a decrease in weight, strength, or some other quality.

Origin:

Middle english 'losien' from old english 'losian' meaning to lose, from proto-germanic 'leusōną' meaning to lose.

Examples:

1. She always loses her keys.
2. The team lost the championship.
3. I lost my wallet.
4. His voice lost its strength.
5. She has lost a lot of weight.