دره

هُوَ ذُوتُدْرَهٍ ذ , and تُدْرَأٍ, He is one who is wont to come suddenly, or unawares, upon his enemies, whence they know not. (TA.) And هُوَ ذُوتُدْرَهِهِمْ, (IAar, JK, K, TA, [in the CK, erroneously, تُدْرِهِهِمْ,]) and تُدْرَئِهِمْ, (TA,) He is the repeller from them, or the defender of them, (IAar, K,) فِى الحَرْبِ [ in war or fight ]: (JK:) you may not say هُوَ تُدْرَهُهُمْ, without ذُو. (TA.) Some say that the ه is a substitute for the ء. but ISd affirms that the two words, with ه and with ء, are dial. vars. (TA.)