Ideal for upper intermediate and advanced learners, this dictionary covers all the words, phrases and idioms that students need to learn and master to be able to speak and write effective American English. With full-sentence definitions written in simple, natural English, this dictionary is easy to use and understand. The examples, taken from the 4.5-billion-word Collins Corpus, show learners how the words are used in authentic contexts. The dictionary provides extensive help with grammar, including grammar patterns and a grammar reference. A wide range of vocabulary-building features encourage students to expand and improve their accuracy and fluency. The dictionary also includes an Activity Guide, which helps students learn how to get the most out of the dictionary; a Writer's Handbook, which gives guidance on spelling, punctuation, letter-writing and CVs, and a Speaker's Handbook, which gives advice on the best set phrases to use in key situations.