Exposed and engraved line of cement between tiles that are joined adjacent to each other.
Quite strong and if you get your nail stuck on one, remove gently. No sudden movements or you'll get it ripped off like a hungry wolf on a chubby sheep.
Human 1:WAIT THAT'S A GROUT LINE. STOP RIGHT THERE.
Human 2: OHMIGOD I AM FREAKING OUT SAVE ME!
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