To stanch is to stop a flow of blood. Stanch the wound, stanch the bleeding, hard to stanch.
Pressure is what does it — firm and directly on the wound, for minutes rather than seconds. The word also spells staunch, and the useful convention is stanch for the verb and staunch for the adjective meaning loyal, though both are used for both.
1verbstanchTo stop a flow of blood.
“The medic worked quickly to stanch the blood pouring from the soldier's leg.”
stanch is a stopping.
Middle English stanch, from Old French estanchier, to stop a flow. Staunch is a variant of the same word.
Middle English
stanch
English, today
stanch
Built from
From Middle English stanch, a variant of staunch, staunche (“(adjective) in good condition or repair; solidly made, firm; watertight; of a person or wound: not bleeding; certain; intact; (adverb) firmly, soundly”)stanch; see further at staunch.
Etymology from Wiktionary, CC BY-SA