"Time" is the most commonly used noun in the English language. The word itself is used in a 31 of ways: we can kill time, do time, save it, and spend it. Time even takes on a medicinal role when it comes to healing both physical and emotional 32 . Most of us wish we 33 more of it, and yet time persists as an object of value, as in "Time is money," and an enemy of every person, as in "The deadline is approaching" or "His days are 34 ." It is, eventually, the thing 35 kills all of us. And yet for all its pervasiveness in our everyday conversations, describing what time is doesn't come easily. 31