nail your colours to the mast
nail (one's) colours to the mast
To refuse to cease or surrender. Because lowering a ship's flag was a customary indication of surrender, this nautical phrase emphasizes the resolve of a ship's crew. We will nail our colours to the mast and fight on—they will never capture us! We're going to have a tough time beating this team now that they are playing with such determination. I fear they've nailed their colours to the mast.
nail your colours to the mastBRITISH, JOURNALISM
1. If you nail your colours to the mast, you state your opinions or beliefs about something clearly and publicly. Note: A ship's colours are its national flag. Let me nail my colours to the mast straightaway. I both like and admire him immensely.
2. If you nail your colours to the mast, you say clearly and publicly that you support a particular person, idea, or theory. Note: A ship's colours are its national flag. In the Thatcher years, the young MP nailed his colours to Mrs T's mast more firmly than most. This was the moment he nailed his colours to the mast of Social Security reform. Note: Battleships used to lower their colours to show that they were surrendering. Sometimes the colours were nailed to the mast as a sign of determination to fight to the end.