butt · noun C /bʌt/
butt
C1 the part of your body that you sit on
Dictionary example:
The baby is learning to walk and keeps falling on her butt.
butt · verb /bʌt/
butt in
C2 to interrupt or join in a conversation or activity when the other people do not want you to
Dictionary example:
The interviewer kept butting in and wouldn't let me answer the question.
Learner example:
"Was it a big one, Granny?", the little girl butt[ed] in. (Certificate of Proficiency in English; C2; Spanish)
