TROW

tro: An obsolete verb meaning "to believe"; compare "trust" and the German trauen. It occurs only in Luke 17:9, the King James Version "Doth he thank that servant. ...? I trow not," as a translation of ou doko, "I believe not." The words ou doko, however, are not part of the original text, but are a later gloss to supply an answer to the question, and hence, "I trow not" is omitted by the Revised Version (British and American).

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.