chatter-mark

chatter mark

noun
1.
a mark left by a tool that has been chattering.
2.
Geology. any of a series of irregular gouges made on rock surfaces by the slipping of rock fragments held in the lower portion of a glacier.

Origin:
1885–90

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World English Dictionary
chatter mark
 
n
1.  any of a series of grooves, pits, and scratches on the surface of a rock, usually made by the movement of a glacier
2.  another name for chatter

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