noun
a substance or product used to make something thinner or less thick
adjective
comparative form of the adjective 'thin', meaning having a lesser thickness or extent in one dimension
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The new material is significantly thinner than the previous version.
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I need to buy some new pants, these ones are getting too thin.
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I've been hitting the gym, trying to get thinner for summer.
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As time passed, the line between reality and dreams grew thinner and thinner.