headbutt
verb /ˈhedbʌt/
  /ˈhedbʌt/
(especially British English)Verb Forms
| present simple I / you / we / they headbutt |  /ˈhedbʌt/  /ˈhedbʌt/ | 
| he / she / it headbutts |  /ˈhedbʌts/  /ˈhedbʌts/ | 
| past simple headbutted |  /ˈhedbʌtɪd/  /ˈhedbʌtɪd/ | 
| past participle headbutted |  /ˈhedbʌtɪd/  /ˈhedbʌtɪd/ | 
| -ing form headbutting |  /ˈhedbʌtɪŋ/  /ˈhedbʌtɪŋ/ | 
- headbutt somebody to deliberately hit somebody hard with your head- He was sent off for headbutting the goalkeeper.