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sharp

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1sharp/ˈʃɑɚp/adjective
sharpersharpest
1sharp
/ˈʃɑɚp/
adjective
sharpersharpest
Learner's definition of SHARP  
[also more sharp; most sharp]
: having a thin edge that is able to cut things or a fine point that is able to make a hole in things
— opposite blunt, dullsee also razor-sharp
: sudden and quick
   b  : involving a sudden change in direction
: clear and easy to see
   b  : very noticeable
: having or showing a quick ability to notice and understand things
: very sudden and severe
: critical or harsh
: loud, short, and sudden
of cheese  : having a strong odor and flavor
: very strong and cold
10  disapproving  : clever in a bad or dishonest way
11  : ending in a point or edge
12  informal  : stylish or fashionable
music 
13  : higher than the true pitch
   b  : higher than a specified note by a semitone
— compare 1flat 10, 1natural 8

keep a sharp eye on

: to watch (someone or something) carefully

— sharpness

noun,[noncount]
2sharp/ˈʃɑɚp/adverb
2sharp
/ˈʃɑɚp/
adverb
Learner's definition of SHARP  
: exactly — used to refer to an exact time
: above the correct musical pitch
— compare 3flat 4

look sharp

informal
: to act quickly : hurry
3sharp/ˈʃɑɚp/noun
pluralsharps
3sharp
/ˈʃɑɚp/
noun
pluralsharps
Learner's definition of SHARP  
[count]
: a musical note that is one semitone higher than a specified note
also  : a written symbol ♯ that is placed before a note to show that it should be played a semitone higher
— compare 2flat 3, 2natural 2
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