Sound the trumpet is an expression that has been used for centuries to signify a call to action. It is often used in military contexts to signal a battle or to rally troops. The term can also be used figuratively to refer to a call to action in other contexts. In this crossword, the solution to the clue 'BLARE' (5 letters) is the word 'SOUND, ' which is a synonym for BLARE and is part of the phrase 'SOUND the trumpet.'