Wiktionary
underplate
n. 1 An armoured plate that forms part of a mortice lock 2 (context geology English) A tectonic plate that forms or moves under another vb. (context geology English) To act as an underplate
Usage examples of "underplate".
The shimmering underplate on which the city floated, dented down by the first impact, now collapsed around the club head.
I have unlimited access to the free, fast, safe and totally dependable underplate transport system.
They had underplated the stream so that it did what it was supposed to do.