Online dictionary: English Cobuild translation of words and expressions, definition, synonyms

To meet the needs of people learning English, Reverso offers a free English dictionary that goes far beyond what a normal monolingual dictionary or thesaurus can provide by explaining the use of words and phrases in natural language and providing real-life examples. This English dictionary for learners features definitions written in language that is easy to understand, examples taken from actual texts and conversations, and explanations of grammar.

See the latest user contributions to the English dictionary and add your own:

A seagrass species that is endemic to the Mediterranean Sea. Also called Neptune grass.
person who cleans tables also busboy
a dose of medicine in the form of a small pellet
encounter mostly for sex done around lunch time
fear of better options
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Help us write our English dictionary

One of the biggest challenges when you learn English is keeping up with new words and meanings that enter the language. The meaning of slang, colloquial expressions and idioms is often difficult to figure out, and it takes time for them to appear in traditional paper and online dictionaries. That’s why Reverso offers you the opportunity to share your knowledge and help others learn English by adding words and phrases to the online dictionary, with definitions, synonyms, and examples of use.

A wide-ranging dictionary lookup tool

The English dictionary for learners is more than just an ordinary monolingual dictionary, because the results include grammar notes and examples from English as it is really used. By simply clicking on an English word, you can also see its synonyms, hear its pronunciation, or conjugate it.

Why use the Cobuild English dictionary

  • It is tailored to meet the needs of learners of English, offering a wealth of information on grammar, spelling, and usage of English words
  • A perfect add-on to a bilingual dictionary, a valuable aid when doing English translations, and a useful complement to classic synonyms and monolingual dictionaries
  • A dictionary of real, idiomatic language that will quickly help you improve your proficiency in English
  • Enjoy the advantages of the collaborative dictionary: English idioms with definitions, synonyms and examples, added by users
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"