Entry 2 senses · 2 variants Webster, 1913 pitprop · pit·prop · IPA n. n. 01 n. A wooden prop used to support the roof of a mine temporarily. 1. A wooden prop used to support the roof of a mine temporarily. 02 n. A wooden prop used to support the roof of a mine temporarily. 1. A wooden prop used to support the roof of a mine temporarily.