noun
a viral infection of the larynx, trachea, and bronchial tubes that is common in young children and is characterized by hoarseness, a barking cough, and difficult breathing
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The pediatrician diagnosed the child with croup, a viral infection that causes swelling in the airways.
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My baby cousin has croup and it's been keeping him up all night with that barking cough.
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I heard that nasty cough, it sounds like your kid has the croup or something.
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The croup of negativity in the office was spreading like a contagious illness, affecting everyone's mood.