There are two ways of spelling this word. The British spell it behove, while the word, it is pronounced the same way. The first e is like the I in bit, kit and sit. The following o is like the o in go, so and no. The final e is silent and the stress is on the second syllable. The word sounds like beyove and it is mostly used in rather formal contexts. Behove means Appropriate or necessary. If it behoves you to do something it is necessary for you to do it.
Here is an example.
• Remember, you are under oath. It behoves you to tell the truth.