Translation

• to make dirty
• to defile
• to smear

Examples

• 这个男孩把他的手弄脏了。
  The boy got his hands dirty.
• 我的衣服被油弄脏了。
  My clothes were dirty with oil.
• 你可以拿走这本书，但可别把它弄脏了。
  You may take this book as long as you keep it clean.
• 吃午饭的时候，一坨芥末酱滴下来弄脏了我的领带。
  A drop of mustard fell and stained my tie during lunch.
• 我的书每一本都可以借给你，只要你不把它们弄脏就行了。
  I will lend you any book that I have, so long as you keep it clean.