noun
a faint design made in some paper during manufacture, which is visible when held against the light and typically identifies the maker
verb
to mark with a watermark
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The watermark on the document served as a security measure.
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I added a watermark to my photos before posting them online.
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I always watermark my artwork so no one can steal it.
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Her kindness was like a watermark on her character, leaving a lasting impression on everyone she met.