köken: From Byzantine Greek τρελός (trelós), from Koine Greek τρηρός (trērós), from Ancient Greek τρήρων (trḗrōn). The chess sense is a semantic loan from French fou.
köken: From ne- (“not”) + bun (“sane”). The sense “bishop (chess piece)” is a semantic loan from French fou, from Spanish alfil, from Arabic الفيل (al-fīl, “elephant, chess bishop”).
mad, rabid (affected with rabies) · mad, crazy, insane (having mental, psychological problems; behaving as one who has lost his mind; expressing such condition) · crazy (which acts, behaves, speaks very loud, making noise, being fast, unrestrained; such that it expresses such behavior)
çekim: karşılaştırma trakāks · üstünlük vistrakākais
köken: From Proto-Baltic *trek-, *trak-, from Proto-Indo-European *terk-, *trek- (“to turn”), from the stem *ter- (“to turn; to rub, to grate (by turning); to drill, to pierce”). The meaning probably evolved from “turning, drilling” to “moving quickly” ( > “aggressively”) to “crazy, mad.” Cognates include Lithuanian trãkas (“crazy; quick, fast”).