| For some reason that eluded him at the time, her last comment startled Jack, sending a red flag up almost instantaneously. |
| The red flag became the symbol of the blood of working class martyrs in their battle for workers rights. |
| In Mr. Wilson's view, these were very strong words that were raising a red flag and setting off alarm bells. |
| The red flag was first raised as a symbol of rebellion by river workers in 18th century London. |
| A rain shower made conditions dangerous and the red flag was shown to the drivers with two laps remaining. |
| The link between May Day and the use of the red flag as a symbol for socialist workers is close, perhaps above all in France. |
