DictionarybonkSudden exhaustion
verb

bonk

Suddenly lose energy during prolonged exercise.

The cyclist bonked near the end of the long ride.

Etymology

Bonk is an expressive word for a dull impact. In endurance activity, it names an abrupt collapse of energy, using the image of being suddenly stopped or knocked down.

More examples

  • He slowed sharply when he began to bonk.
  • She described bonking halfway through the endurance event.
  • The exhausted runner had clearly bonked.

Forms

bonk · bonks · bonked · bonking

Similar words

flag
Flag means lose energy gradually; bonk suggests a sudden sharp exhaustion during sustained effort.
hit the wall
Hit the wall is the common endurance-sport expression for a similar abrupt energy collapse.