Did you know?

Click any word in a definition or example to find the entry for that word

hat - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun [countable]     hat pronunciation in British English
Word Forms
  1. 1
    a piece of clothing that you wear on your head

    She was wearing a brown fur hat.

  2. 2
    informal one particular aspect of someone’s duties or responsibilities

    She has to wear several different hats (=have various responsibilities) in her position.

    Of course, when I say this, I’m wearing my teaching hat.

  3. From our crowdsourced Open Dictionary
    I'll eat my hat a phrase said when you are sure that something (usually an event) is unlikely to take place

    If you visit Surat, I'll eat my hat.

    If I manage to do even one closure, I'll eat my hat.

    If he comes back, I’ll eat my hat.

    Submitted by Darshi from India on 24/11/2015
  4. From our crowdsourced Open Dictionary
    all hat and no cattle/too much hat and not enough cattle American all talk and no action

    Let it never be said that Texas business leaders are all hat and no cattle.

    Submitted from United Kingdom on 26/02/2016
quiz invitation


a description of an economic or political situation based on analysis of information at the present time

BuzzWord Article

Open Dictionary


an unregulated form of capitalism that features financial deregulation, privatisation and low tax for high earners

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play