Third person singular present tense of bonk; hits with a dull sound or runs out of energy during strenuous activity.
From the onomatopoetic root 'bonk' that mimics impact sounds, with standard English inflection for present tense third person singular.
In sports broadcasting, you'll hear 'he bonks!' describing both a missed tennis shot and a cyclist running out of fuel—one word doing double duty for very different physical failures!
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