To protect from harm or danger. The soldiers were ordered to defend the fortress against the enemy attack.
To speak or write in support of someone or something that is being criticized or attacked. She defended her friend when he was accused of cheating.
To attempt to prevent an opponent from scoring in a game or sport. The team worked hard to defend their lead in the final minutes of the match.
To maintain or support a legal case in court. The lawyer was hired to defend the accused in the trial.
To attempt to retain a title, position, or status by competing or fighting against challengers. The boxer will defend his heavyweight title next month.