The meaning of this cliché to end all clichés is to think creatively, unimpeded by orthodox or conventional constraints. It originated in the USA in the late 1960s/early 1970s & has become one of the most hackneyed of all expressions. It was first used in the business world, where 'thinking outside the box' has become so common as to be meaningless. It has replaced an earlier expression 'blue sky thinking', which dates to 1945. See for a full explanation:- http://www.phrases.org.uk/meanings/think-outside-the-box.html I observe that tureng provides us with several synonyms, one of which is 'at gözlüğünü çıkarmak'. The others like :-'geniş bir perspektiften bakmak' seem like mere paraphrases. Is there a commonly used but native Turkish idiom?