Obs. rare. [Etymology obscure.] ? Strenuous, hard, severe.
c. 1430. Syr Gener. (Roxb.), 3947. [Generides] was in hert thral; His shelde he made from him to fall.
c. 1525. in Rel. Ant., II. 118. At Beverley a sudden chaunce did falle, The parish chirch stepille it felle At evynsonge tyme, the chaunce was thralle, Fourscore folke ther was slayn thay telle.
