permanent marker
US /ˈpɜːr.mə.nənt ˈmɑːr.kər/
UK /ˈpɜːr.mə.nənt ˈmɑːr.kər/
1.
a type of marker pen that writes on surfaces in a way that cannot be easily removed
:
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Be careful not to write on the table with a permanent marker.
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I need a permanent marker to label these boxes.