This is the 17271st most frequent Turkish word.
önlüklerine
"To their aprons."
Here, 'önlüklerine' refers to the aprons belonging to the children, serving as a possessive form with an indirect object inflection.
Çocuklar okulda beyaz önlüklerine özen gösteriyor.
The children care about their white aprons at school.
In this sentence, 'önlüklerine' shows possession and also acts as the recipient of the action 'embroidering logos'.
Garsonlar, yeni önlüklerine logolarını işlettiler.
The waiters embroidered their new aprons with logos.
'Önlüklerine' in this case indicates possession (their aprons) and the target of the action 'writing names on them'.