Origin of trowMiddle English trowen ; from Old English treowian, to have trust in (akin to German trauen) ; from treow, faith, belief: see true
intransitive verbtrowed, trow·ing, trows Archaic
Origin of trowMiddle English trowen, from Old English trēowian, to trust; see deru- in Indo-European roots.
(third-person singular simple present trows, present participle trowing, simple past and past participle trowed)
From Middle English trowen, trouwen, treuwen, treowen, from Old English trēowan, trīewan (“to trust”) and Old English trūwian (“to trust, confide”), from Proto-Germanic *triwwijaną (“to trust”) and Proto-Germanic *trūwijaną (“to trust”); both from Proto-Indo-European *drew- (“faithful, true”). Akin to Scots trow, trew (“to believe, trust, confide in, prove”), Dutch trouwen (“to wed, marry”), German trauen (“to trust, marry”), Danish tro (“to believe, think”), Icelandic trúa (“to trust, believe, believe in”).
(countable and uncountable, plural trows)