verb
A verb is a word that expresses an action or a state of being. In this case, 'lose' is the verb in the phrase 'lose its shine'.
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Over time, the metal surface may lose its shine due to exposure to harsh chemicals.
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If you don't take care of your car, it will eventually lose its shine.
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That new phone of yours is going to lose its shine real quick if you keep dropping it.
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As she struggled with her self-esteem, her confidence started to lose its shine.