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Download a Kindle-compatible version of the dictionary here. Unzip the .rar archive.
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Get the "Send to Kindle" program on your computer. Here's the link for the Mac.
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Right-click your recently downloaded (unzipped) dictionary file, and click the "Send to Kindle" menu item. It will arrive on your Kindle shortly.
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Once the dictionary has arrived, go to your settings -- on 2019 paperwhite Firmware 5.11.1, it's at Home -> settings -> all settings -> Languages & Dictionaries -> Dictionaries -> English. Choose the Webster's 1913.