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hard-on

noun [C]
 
 
/ˈhɑːd.ɒn/ US  /ˈhɑːrd.ɑːn/ offensive

Definition

an erection (= the condition of the penis when it is stiff): to have a hard-onSexual activity in generalPhysical and sexual assault and abduction
(Definition of hard-on noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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