د ح ضd-ḥ-ḍ
(ف) دَحَضَ يَدْحَضُ دَحْضًاdaḥaḍa yadḥaḍu daḥḍan: (of a thing) to slip from its place; (of an argument) to be void, to be refuted.
دَاحِضٌdāḥiḍ (active participle, ism fāʿil): that which slips, that which is refuted. ﴿حُجَّتُهُمْ دَاحِضَةٌ عِنْدَ رَبِّهِمْ﴾ (Ash-Shūrā 42:16)
Form IV (ifʿāl) اَدْحَضَ يُدْحِضُ اِدْحَاضًاadḥaḍa yudḥiḍu idḥāḍan: to cause to slip, to refute. ﴿لِيُدْحِضُوْا بِهِ الْحَقَّ﴾ (Al-Kahf 18:56)
مُدْحَضٌmudḥaḍ (passive participle, ism mafʿūl): one who is made to slip, defeated. ﴿فَسَاهَمَ فَكَانَ مِنَ الْمُدْحَضِيْنَ﴾ (Aṣ-Ṣāffāt 37:141)