This is the 879th most frequent Turkish word.
ettim
"Ettim" means "I did" in English.
The word 'ettim' is used as the first-person singular past tense of 'etmek,' meaning 'to do' or 'to perform.'
Bugün çok iş yaptım ve yoruldum.
Today, I did a lot of work and got tired.
Here, 'ettim' is used in the context of performing the act of 'thanking,' derived from the verb 'etmek.'
Onun iyiliğini unutmadım, teşekkür ettim.
I didn't forget their kindness, I thanked (him/her).
In this sentence, 'ettim' indicates the performance of the act of conversing, again formed from 'etmek.'