Webster’s Revised Unabridged Dictionary · 1913
Roust
Roust (roust), v. t. To rouse; to disturb; as, to roust one out. [Prov. Eng. & Local, U.S.]
Roust, n. [Cf. Icel. röst an estuary.] A strong tide or current, especially in a narrow channel. [Written also rost, and roost.] Jamieson.