challenged definition, challenged meaning | English dictionary

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      vb   mainly tr  
1    to invite or summon (someone to do something, esp. to take part in a contest)  
2    also intr   to call (something) into question; dispute  
3    to make demands on; stimulate  
the job challenges his ingenuity     
4    to order (a person) to halt and be identified or to give a password  
5      (Law)   to make formal objection to (a juror or jury)  
6    to lay claim to (attention, etc.)  
7    intr     (Hunting)   (of a hound) to cry out on first encountering the scent of a quarry  
8    to inject (an experimental animal immunized with a test substance) with disease microorganisms to test for immunity to the disease  
9    a call to engage in a fight, argument, or contest  
10    a questioning of a statement or fact; a demand for justification or explanation  
11    a demanding or stimulating situation, career, object, etc.  
12    a demand by a sentry, watchman, etc., for identification or a password  
13      (U.S.)   an assertion that a person is not entitled to vote or that a vote is invalid  
14      (Law)   a formal objection to a person selected to serve on a jury (challenge to the polls) or to the whole body of jurors (challenge to the array)  
     (C13: from Old French chalenge, from Latin calumnia calumny)  
  challengeable      adj  
  challenger      n  
English Collins Dictionary - English Definition & Thesaurus  
ice bucket challenge n.
activity involving dumping a bucket of ice water on your head and challenge other three friends to do so in order to promote awareness of the disease amyotrophic lateral sclerosis (ALS) and encourage donations to research.
also called "ice water challenge", viral campaign on social media during July–August 2014

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Collaborative Dictionary     English Definition
You say 'top that!' when you have achieved something and you want to challenge other people to do better
I know four celebrities - top that!
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