这个习语形容一个人的性格孤僻或喜欢独处。与前两个关于“事”的保密不同，这个词侧重于描述一个人的社交风格，即不喜欢与邻居或同事过度交往。

• He’s a quiet neighbor who mostly keeps himself to himself. ^{他是个安静的邻居，平时深居简出，不怎么跟人往来。}
• Since moving to the new city, she has kept herself to herself. ^{自从搬到这个新城市以来，她一直过着独来独往的生活。}
• They are very private people and tend to keep themselves to themselves. ^{他们是很注重隐私的人，倾向于不与人社交。}