1）（为阻止敌人或对手成功而）毁坏，破坏（设备、武器或建筑物）。
to damage or destroy equipment, weapons, or buildings in order to prevent the success of an enemy or competitor
2）阴谋破坏，蓄意破坏（计划或行动）。
to intentionally prevent the success of a plan or action
on purpose 故意地。

【例句】
This was a deliberate attempt to sabotage the ceasefire.
这是一次蓄意破坏停火的行为。
 
I didn't do it on purpose - it was an accident.
我不是故意这样做的，是个意外。