keep to oneself

v.

保守秘密，不交际；杜门不出；落落寡交；

Cycling helps to keep oneself fit, curb pollution
Bond with me and the river : I work on flood hazard map making to keep by oneself and introduce me
How to Keep Oneself over the Abyss
Professional licensure protection strategies: how to keep oneself from being investigated and protect oneself if an investigation is...
[Struggle to keep oneself afloat as seen from abroad]
[Be oneself eatable, in moderation, a condition to keep a healthy spirit in a healthy body].
6. Technical Analysis
"We have to keep transforming ourselves to become who we ought to be"
‘Keeping Yourself to Yourself’: Private Lives and Public Spectacles
Catching objects thrown to oneself: Testing control strategies for object interception in a novel domain.