learn the rule: lose / loose

  • lose is a verb, indicating to be deprived of or cease to have something
    • Did you lose your sock?
    • I don't know where or when I lost my potato.
    • I am very sad at the loss of my intelligence.
  • loose is an adjective, meaning something which is not firmly attached or fixed in place (or slang, for a slapper with a big fanny)
    • You have a loose grip on the English language.
    • You're loose and smell of fish.
  • The two are not interchangeable.
  • Getting it wrong makes you look stupid. And ugly. And smell of fish.