This is the 15907th most frequent Turkish word.
tırmandığım
"The one that I climb" or "that I am climbing."
Here, "tırmandığım" is a past-tense relative clause derived from "tırmanmak" (to climb) conveying the action of climbing, referring to the tree.
Tırmandığım ağaç çok yüksekti.
The tree I climbed was very tall.
In this sentence, "tırmandığım" describes the mountains that were climbed in the past by the speaker, indicating a completed action related to them.
Tırmandığım her dağ bana yeni bir tecrübe kattı.
Every mountain I climbed gave me a new experience.
Here, "tırmandığım" is used to specify the place associated with the climbing action, indicating the location climbed by the narrator.