noun
a key to interpreting or deciphering something
verb
to convert (a text written in code) into ordinary language; decode
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The cryptographer was able to decipher the complex code within minutes.
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I can't seem to decipher this handwriting, can you help me?
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I'm trying to decipher what she really meant by that text message.
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It took me a while to decipher the hidden meaning behind his words.