v. Obs. [OE. treowsian, trywsian, early ME. treosi-en, tr(e)ousi-en, f. treow troth, faith.] a. refl. and intr. To pledge oneself, give assurance, engage. (Only OE.) b. trans. To prove to be true. c. intr. To rely on.
a. 901. Laws of K. Ælfred, c. 19. Gyf he hine trywsian wylle … ðæt he mot.
a. 1000. O. E. Chron., an. 972. Him comon onʓean .vi. cyningas and ealle wið [hine] trywsodon [v.r. ʓetreowsodon] ðat hi woldon [etc.].
1205. c. Lay., 8315. And þu hit nult ileuen … Ich hit wulle trousien. Ibid., 8489. Þas weord ich wulle þe treosien Þurh mine tirfulne god. Ibid., 9308. Þe king him treousede on, For he wes swa æht mon.
