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it takes one to know one

ɪt teɪks wʌn tuː noʊ wʌn

Relationships
informal
beginner
Literally:
Recognizing something requires being that thing yourself

What does "it takes one to know one" mean?

  1. You can only recognize a quality because you share it
  2. Used to deflect an insult by suggesting the accuser has the same flaw

Examples

  • 'You're so stubborn!' 'Well, it takes one to know one.'
  • He called me a nerd, but it takes one to know one.
  • It takes one to know one—you're just as guilty.

Origin

A playground retort suggesting that recognizing a negative trait means you possess it yourself. Used as a comeback to insults.

How to use it

Childish retort but used by adults too. Deflects criticism by implicating the critic.

Similar expressions

you're one to talk
pot calling the kettle black

Opposites

fair criticism
valid observation

Related idioms

  • break the ice

    To initiate conversation in an awkward social situation

  • see eye to eye

    To agree with someone completely

  • head over heels

    Completely and deeply in love

  • pull someone's leg

    To tease or joke with someone

  • cut someone some slack

    To be less strict or demanding with someone

  • tie the knot

    To get married

Use it in a practice answer

Try "it takes one to know one" in a CELPIP-style Speaking or Writing task. The AI feedback tells you whether your word choice worked.

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