The phrase "the big picture" basically means the major, main, or important part of something. A person is described as seeing the big picture when he can understand a situation or concept as a whole rather than getting bogged down on specific details. For example, a business owner can be described as seeing the big picture if he can easily gauge whether a business matter is a success or likely to be successful on the whole rather than by picking apart every detail. In some regions, "the big picture" is a commonly used expressive phrase that is not meant to be interpreted literally.
People often use expressive phrases, called idioms, in their speech, especially when they speak to others in a casual manner. These types of phrases are meant to express thoughts and feelings in a non-literal manner. There are many types of idioms a person may use to express himself, and some of them are common in some regions yet not at all known in others. "The big picture" is one idiom that is most commonly used in the United States, though it may be heard in other English-speaking regions as well. A person is said to see the big picture when he gets the gist of something and is not distracted by details that may prove confusing.
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________*التــَّـوْقـْـيـعُ*_________
لا أحد يظن أن العظماء تعساء إلا العظماء أنفسهم. إدوارد ينج: شاعر إنجليزي