The Collaborative International Dictionary of English v.0.48:
Stanch \Stanch\, a. [Compar. Stancher (-[~e]r); superl.
Stanchest.] [From Stanch, v. t., and hence literally
signifying, stopped or stayed; cf. Sp. estanco stopped,
tight, not leaky, as a ship. See Stanch, v. t.] [Written
1. Strong and tight; sound; firm; as, a stanch ship.
One of the closets is parqueted with plain deal, set
in diamond, exceeding stanch and pretty. --Evelyn.
2. Firm in principle; constant and zealous; loyal; hearty;
steady; steadfast; as, a stanch churchman; a stanch friend
or adherent. --V. Knox.
In politics I hear you 're stanch. --Prior.
3. Close; secret; private. [Obs.]
This is to be kept stanch. --Locke.