conquassation

from The Collaborative International Dictionary of English v.0.48

Conquassate \Con*quas"sate\, v. t. [L. conquassatus, p. p. of
   conquassare.]
   To shake; to agitate. [Obs.] --Harvey. -- {Con`quas*sa"tion},
   n. [Obs.]
   [1913 Webster]