noun, informal - doing something to someone because they did the same thing to you
adjective - causing difficulty, problems, or annoyance
noun, American English - a thick liquid that is used for washing plates, pot, pans etc.
noun - goods that are taken into or out of a country illegally, or that are possessed illegally
adverb - used to express relief or gratitude that something good has happened or that a bad situation has been avoided
noun - a full-size or scaled model of a design used to show, test, or evaluate how something will look or work before it is made