Blue Peter

blue flag with a central white square, used to show that a ship is about to sail 开航旗（蓝底、中间有一白色正方形的信号旗）.

blow-hole, blow-out, blow-up, blowed, blower, blowfly, blowhard, blowing-up, blowlamp (US torch, blowtorch), blown, blowy, blowzy, blubber, bludgeon, blue, blue baby, blue blood, blue book, blue cheese, blue ensign, blue ribbon, blue tit, blue whale, blue-blooded, blue-chip, blue-collar, blue-eyed, blue-pencil, bluebell, blueberry, bluebottle, bluejacket, blueness, blueprint, blues, bluestocking, bluff, bluffness, bluish, blunder,