open book

His life story is an open book.

Definition

1. Noun:
   • Something easily understood or interpreted: "open book" refers to a person, situation, or thing that is transparent, straightforward, and without hidden aspects. It implies that everything is readily apparent or accessible.
   • A person who is candid or honest: Used to describe someone who does not conceal their thoughts, feelings, or intentions.

Usage Examples

• Noun:
  • His life is an open book; he shares everything with his friends. (His life is transparent and easily understood.)
  • She is an open book, so you can always trust what she says. (She is honest and does not hide anything.)
  • The investigation was an open book, with all documents available for review. (The investigation was conducted openly and without secrecy.)

Advanced Usage

• "to be an open book": to be completely transparent or easy to read.

  • After years of marriage, her husband's moods are an open book to her. (She can easily understand his emotions.)

• "to read someone like an open book": to understand someone's thoughts or feelings very easily.

  • The detective could read the suspect like an open book. (The detective could easily discern the suspect's intentions.)

Variants and Related Words

• Open-book (adj): referring to an exam or test where notes or textbooks are allowed.

  • The professor gave an open-book exam, so we could use our notes. (An exam where reference materials are permitted.)

• Open (adj): not closed or hidden; accessible.

  • She kept an open mind during the discussion. (She was receptive to new ideas.)

Synonyms

• Transparent: easy to see through or understand.
• Candid: truthful and straightforward.
• Forthcoming: willing to share information.
• Unconcealed: not hidden or secret.

Related Idioms

• An open book: a person or thing that is easy to understand or predict.

  • Don't worry about his motives; he's an open book. (His intentions are clear.)

• Read someone like a book: to understand someone's thoughts or feelings very well.

  • She can read her brother like a book, so she knows when he's lying. (She can easily interpret his behavior.)

• Open and shut case: a situation that is clearly resolved or decided.

  • The evidence made it an open and shut case. (The case was straightforward and easy to solve.)