1. hits or strikes something with a dull sound
Usage: informal
2. falls asleep suddenly or becomes extremely tired
Usage: informal

1. a dull hitting sound or the act of hitting
Usage: informal

Examples

• She bonks her head on the low ceiling every morning.
• The hammer bonks against the nail repeatedly.
• After staying up all night, he just bonks at his desk.
• The runner bonks after mile twenty of the marathon.
• I heard a loud bonk when the ball hit the window.
• The bonk on his head left a small bruise.
• The tired child bonks right after dinner.