Definition of tall adjective from the Oxford Advanced American Dictionary

      

    tall

     adjective
    adjective
    NAmE//tɔl//
     
    (taller, tallest)
     
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  1. 1(of a person, building, tree, etc.) having a greater than average height She's tall and thin. tall chimneys the tallest building in the world a tall glass of iced tea opposite short
  2. 2used to describe or ask about the height of someone or something How tall are you? He's six feet tall and weighs 200 pounds. Which Word?high / tall High is used to talk about the measurement from the bottom to the top of something:The fence is over five feet high. He has climbed some of the world’s highest mountains.You also use high to describe the distance of something from the ground:How high (up) was the plane when the engine failed? Tall is used instead of high to talk about people:My brother’s much taller than me.Tall is also used for things that are high and narrow, such as trees:She ordered cold beer in a tall glass. tall factory chimneys.Buildings can be high but they are much more frequently tall.
  3. Idioms
    be a tall order(informal)
     
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    to be very difficult to do
    great/tall oaks from little acorns grow(saying)
     
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    something large and successful often begins in a very small way
    to show that you are proud and able to deal with anything to feel proud and confident
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: tall