Entry 2 senses · 2 variants Webster, 1913 Roust /(roust)/ · IPA /ɹaʊst/ v. t. n. 01 v. t. To rouse; to disturb; as, to roust one out. 1. To rouse; to disturb; as, to roust one out.[Prov. Eng. & Local, U.S.] 02 n. A strong tide or current, especially in a narrow channel. 1. A strong tide or current, especially in a narrow channel.