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English Vocabulary: Links

See also Select an English Dictionary. Most dictionaries mentioned here also have an app, but most are not free.

(for learners) Cambridge Dictionaries (UK, US) | Oxford Advanced Learner’s Dictionary (UK, US) | English - Thai (UK, US)
(for all) Merriam-Webster App (US) | Merriam-Webster Dictionary and Thesaurus (US) | VISUAL Dictionary Online (US)
PROVERBS, IDIOMS, PHRASES, etc. Oxford Living Dictionaries | VOA English in a Minute (videos) | Phrases, sayings, idioms and expressions
SLANG (for all) American English Slang - Lessons (videos) | Online Slang Dictionaries and Language Links | Urban Dictionary | Slang City
(for learners) Oxford Online Collocation Dictionary
(for all) Merriam-Webster App | Merriam-Webster Dictionary and Thesaurus | MS Office Thesaurus (Review Tab)