-dir

From Proto-Turkic *tur- (“to stand”).^[1]

-dir

1. Third-person singular present simple copula (used suppletively in place of *imək):
   1. [he/she/it] is

-dir

1. Causative suffix.^[2]

   ‎gəzmək (“to walk”) + ‎-dir → ‎gəzdirmək (“to take out for a walk”)

   ‎bilmək (“to know”) + ‎-dir → ‎bildirmək (“to inform”)

• IPA^(key): /diɾ/

From Ottoman Turkish ـدر (-dir), from Proto-Turkic *tur- (“to stand”). Cognate with Turkish durmak (“to stand, to stop”).

-dir

2. (auxiliary, defective, + noun) is

   Bu benim evimdir. ― This is my house.

From Proto-Turkic *-tur (causative suffix).

-dir

2. Causative suffix.

   ‎gezmek (“to walk”) + ‎-dir → ‎gezdirmek (“to take (one) out for a walk”)

   ‎bilmek (“to know”) + ‎-dir → ‎bildirmek (“to inform”)