Definition of "bonk" [bonk]

• To strike or cause to come into contact: She bonked her head going through the low doorway. (verb-transitive)
• To collide against something: His head bonked against the wall as he fell. (verb-intransitive)
• A blow to the head. (noun)
• A hollow thud. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "*tink scraaaatch hey! bonk clink ow! tink tock bonk*"
• "So it's important not to "bonk" - the term used to describe what happens when muscle fuel (glycogen) is depleted and a runner "hits the wall.""
• "He passed out while standing, and the bonk was his cranium bouncing off the floor."