Noun, Suru verb, Intransitive verb
1. erection (of the penis); becoming erect; stiffeningPhysiology
Noun, Suru verb, Intransitive verb
2. welling up (of an emotion)
Wikipedia definition
3. ErectionPenile erection is a physiological phenomenon where the penis becomes enlarged and firm. Penile erection is the result of a complex interaction of psychological, neural, vascular and endocrine factors, and is usually, though not exclusively, associated with sexual arousal or sexual attraction. The angle of an erect penis varies from pointing downwards, upwards, sideways, or may bend. Erections during sleep or when waking up are known as nocturnal penile tumescence.
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