This is the 179th most frequent Marathi word.
ठर
A decision, resolution, or agreement.
The word "ठर" is used here as a verb to mean "decided" or "planned."
आम्ही उद्या भेटण्याचे ठरवले.
We decided to meet tomorrow.
The word "ठर" is here used to indicate being decided or determined.
तो ठरला आमचा मुख्य मार्गदर्शक.
He was decided as our main guide.
In this sentence, "ठर" is used in the context of something being determined or decided.