"strong rope which supports a ship's mast," from O.E. stæg, from P.Gmc. *stagan (cf. Du. stag, Low Ger. stach, Ger. Stag, O.N. stag), from PIE *stak-, ult. an extended form of base *sta- "to stand" (see stet). The verb meaning "secure or steady with stays" is first recorded 1627.