Word: 私自 (sīzì) 私自 dictionary entry sīzì private; secretly Full dictionary entry for 私自 Example sentences using 私自 2 sentences, showing page 1 of 1. 他私自把公司的车开回了家。 Tā sīzì bǎ gōngsī de chē kāi huíle jiā. He secretly drove the company car home. 他私自拿走了我的钥匙。 Tā sīzì názǒule wǒ de yàoshi. He took my keys without asking.