[1] : The Collaborative International Dictionary of English v.0.48

roust \roust\ roust, v. t.
   to rouse; to disturb; as, to roust one out. prov. eng. 
   local, u.s.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

roust \roust\, n. cf. icel. r"ost an estuary.
   a strong tide or current, especially in a narrow channel.
   written also rost, and roost. --jamieson.
   1913 webster
see also:
rost roost 

Roust >> R Words
Roust, definition of term: Roust
roust_pag1.html