let down
verb
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To allow something to go down or lower.
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To make someone feel sad because you didn't do what you promised.
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To make clothes longer by changing the hem.
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To stop trying hard at something.
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To relax or calm down.
Word Explanation:
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'Let down' means to feel sad because something didn't happen like you hoped. Like if you wanted to play outside but it rained, you might feel let down.