to oneself

informal

(informal) Tending not to interact with others; introverted; reserved.

Japanese Meaning

内向的であり、他者との交流を避ける、引っ込み思案な性格を示す / 控えめで、自己主張が少ない傾向がある

Ever since starting at the company, Elena has kept to oneself, rarely joining her coworkers for lunch.

会社に入って以来、エレナは人付き合いを避ける傾向があり、めったに同僚と昼食に行かない。

Sense（1）

(informal) Tending not to interact with others; introverted; reserved.

John was very shy and to himself when he went to school that day.

more to oneself

（ comparative ）

most to oneself

（ superlative ）