This is the 5791st most frequent Turkish word.
sineği
"Sineği" means "the fly" in English.
In this sentence, 'sineği' refers to a particular fly as a direct object of the verb 'I closed'.
Sineği kaçırmadan camı kapattım.
I closed the window without letting the fly escape.
Here, 'sineği' identifies the specific fly in the garden that is being referred to in the sentence.
Bahçedeki sineği kovmak için elimle salladım.
I waved my hand to chase away the fly in the garden.
In this construction, 'sineği' is the object of the action of observing.