隠し事

1. Origins, structure, and basic meaning

• Structure: 隠し事, read かくしごと, is a noun for a matter deliberately kept hidden from other people.
• Basic usage: 隠し事はしない denies withholding anything, while 隠し事がある states that a concealed matter exists.

2. Common pitfalls and similar expressions

• A matter kept from others
  • This refers to the matter or circumstance being kept from others rather than merely the act of hiding. It covers both withholding something in a consultation and a secret that cannot be told even to family.