A trace of something is just a hint or suggestion of it, a very small amount left behind — like the sad cookie crumbs at the bottom of an empty cookie jar.
There are more meanings we can trace to this word trace. As a verb, trace means to follow the course or trail of something, sometimes even chasing or hunting it. It also means to draw or sketch over a picture on translucent "tracing paper." So you could say that Sherlock Holmes traced criminals throughout London, following even the smallest traces of evidence and tracing copies of the villain's notes for his files.
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nv |
an indication that something has been present
follow, discover, or ascertain the course of development of something
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2 |
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a visible mark (as a footprint) left by the passage of person or animal or vehicle
make one's course or travel along a path; travel or pass over, around, or along
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3 |
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a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
make a mark or lines on a surface
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4 |
n |
either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree
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