This is the 14th most frequent Hindi word.
थ
The Hindi word "थ" is a letter in the Devanagari script and does not have a standalone meaning; it represents the sound "tha."
Tha is used to indicate past tense for masculine singular subjects.
वह कल यहाँ आया था।
He came here yesterday.
Tha denotes past tense and first person singular masculine subject here.
मैंने सोचा कि मैं खिलाड़ी था।
I thought I was a player.
Thi is the feminine singular form of tha, used for feminine subjects.