Third person singular present tense of apprehend; captures/arrests someone or understands something mentally.
Regular conjugation of apprehend. From Latin apprehendere with standard English -s suffix for third person singular. The base word has maintained similar forms across Germanic and Romance language families.
The fact that 'apprehends' works for both 'the officer apprehends the criminal' and 'I apprehends your meaning' shows how English once had more grammatical complexity before many verb forms merged together!
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