This is the 3259th most frequent Turkish word.
gözaltı
Detention.
Here, 'gözaltı' is used in its literal sense of detaining someone for questioning.
Polis şüpheliyi gözaltına aldı.
The police detained the suspect.
In this sentence, 'gözaltı' refers to the state of custody or detention.
Geceyi gözaltıda geçirdi.
He spent the night in custody.
This instance utilizes 'gözaltı' in its anatomical sense, referring to the area under the eyes.