A figure of speech wherein a comparison is made between two unlike quantities without the use of the words 'like' or 'as'?

A figure of speech wherein a comparison is made between two unlike quantities without the use of the words 'like' or 'as'?

Explanation
  • A metaphor directly compares two unlike things without using "like" or "as," implying they are the same.
  • Example: "Time is a thief" suggests time takes away moments just like a thief steals.