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Common Mistakes and Confusing Words in English
Loose is an adjective. If something isn't fixed properly or it doesn't fit, because it's too large, it's loose.
My headphones weren't working, because a wire was loose.
Lose is a verb that means to no longer possess something because you do not know where it is, or because it has been taken away from you.
A lot of people will lose their job if there is a recession.