This is the 13209th most frequent Turkish word.
kaybederse
"If he/she/it loses"
In this sentence, "kaybederse" is used in a conditional clause to refer to the potential loss of focus.
Eğer maçta konsantrasyonunu kaybederse, rakibi önüne geçebilir.
If he loses his focus in the match, his opponent might surpass him.
Here, "kaybederse" indicates a hypothetical condition of losing the wallet.
Cüzdanını kaybederse, yenisini almak zorunda kalacak.
If she loses her wallet, she will have to buy a new one.
In this example, "kaybederse" suggests a situation where losing time could impact research completion.