Definition

1. Verb:
   • To injure the brain by causing it to move violently within the skull, typically as a result of a blow to the head; to cause a concussion. This is the primary medical meaning, referring to a traumatic brain injury that temporarily affects brain function.
   • To shake violently; to agitate with force. This is a more general, often literary, meaning describing a powerful shaking motion.

Usage

• The verb concuss is a transitive verb, meaning it requires a direct object (e.g., or ).
• In its medical sense, it is most commonly used in the passive voice (e.g., ) or as a past participle adjective (e.g., ).
• The general sense meaning "to shake violently" is less common in everyday modern English.

Examples

• Medical Meaning:

  • The boxer was concussed by the powerful punch to his head.
  • A fall from the ladder could concuss you.
  • The concussed athlete was removed from the game for evaluation.

• General Meaning (to shake violently):

  • The explosion concussed the air, shattering windows for blocks. (This usage is stylistic and rare in casual speech.)

Advanced Usage

• "to be concussed": This is the standard phrasing to indicate someone has suffered a concussion.
  • She was concussed and had no memory of the accident.
• The noun form "concussion" is far more frequently used than the verb "concuss".
  • He suffered a concussion. (More common than He was concussed.)

Variants and Related Words

• Concussion (n): The injury itself or the act of violently shaking.
  • The patient was diagnosed with a mild concussion.
• Concussive (adj): Having the power to concuss; relating to concussion.
  • The blast produced a concussive wave.

Synonyms

• Medical Sense: Brain (as in , though this is informal).
• General Sense: Shake, jolt, agitate, vibrate violently.

Phrasal Verbs

Related Idioms

• The related noun appears in phrases like

Verb

1. injure the brain; sustain a concussion
2. shake violently