1. shiplap - Noun
2. shiplap - Verb
English Wikipedia has an article on:shiplapWikipedia
shiplap (countable and uncountable, plural shiplaps)
A type of wooden board that has rabbets to allow them to be overlapped.
shiplap (third-person singular simple present shiplaps, present participle shiplapping, simple past and past participle shiplapped)
To overlap boards by this means.
His tip for an über modern look: Cover an entire room in shiplap, and paint it in high-gloss white. Source: Internet
He needed the feel of the shiplap edges digging into his skin, the solidity of wood. Source: Internet
But as with any new project, it's worth trying shiplap in a small area before you commit to a larger portion of your home. Source: Internet