Did you know?

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

set on

 - definition

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.



The thesaurus of synonyms and related words is fully integrated into the dictionary entries. Click on the T button in an entry to review the synonyms and related words for that meaning.

phrasal verb [transitive]
Word Forms
present tense
I/you/we/theyset on
he/she/itsets on
present participlesetting on
past tenseset on
past participleset on
  1. 1
    set someone/something on someone/something British to tell a person or animal to attack another person or animal

    Leave now or I'll set the dogs on you.

  2. 2
    [usually passive] set on someone/something to attack someone or something
See also main entry: set

dark pool

a method of financial trading in which share prices are hidden and not openly available to the public

BuzzWord Article

Word of the Day

bottom gear

the gear that you use for driving a vehicle very slowly

Open Dictionary


to post a tweet, usually a negative one, that mentions a person without using the @ sign, so that they will not see the message on their Twitter feed …

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