1historical A pirate's ensign, typically thought to feature a white skull and crossbones on a black background.
〈史〉海盗旗（通常绘有白色骷髅和交叉的大腿骨，黑底）
Example sentencesExamples
He ordered and some men began hoisting down Robert's black flag with a cutlass and it was replaced with Simon's red flag with a skull over a time glass.
Could she set sail again and raise her black flag, if only in our dreams?
He looked out the porthole and saw the black flag with the silver bird and daggers emblazoned on it as it had always hung since his first days on deck, so many years ago.
The Pacific Northwest is likewise out - too much rain and too many cloudy days make me hoist the black flag and start looking for throats to cut.
She is known throughout the Royal Navy as the ‘Black Duke’ and she flies a black flag from her mainmast at all times.
2historical A black flag hoisted outside a prison to announce an execution.
〈史〉（宣布执行死刑时在监狱外悬挂的）黑旗
3Motorsports A black flag used to signal to a driver to stop at the pits as a punishment for a misdemeanour.
〔赛车〕黑旗（赛车时的信号旗，用于表示赛车手因犯规遭处罚，必须在车道检修站停车）
Example sentencesExamples
Montoya is disqualified from the race after being given a black flag for a technical infringement relating to the incident in the start where he used the spare car.
It was a relief that there were no penalty points for bad driving as I picked up three black flags - meaning a stop and go penalty in the pit lane - in as many laps.
Which driver was disqualified and banned for two races for ignoring a black flag in the 1994 British Grand Prix?
Of course, I didn't want to pass him and get a black flag.
In the season-opening Australian Grand Prix two weeks ago, Coulthard took advantage of a black flag to Schumacher to win.
Definition of black flag in US English:
black flag
nounblæk flæɡ
1historical A pirate's ensign, typically thought to feature a white skull and crossbones on a black background; Jolly Roger.
〈史〉海盗旗（通常绘有白色骷髅和交叉的大腿骨，黑底）
Example sentencesExamples
The Pacific Northwest is likewise out - too much rain and too many cloudy days make me hoist the black flag and start looking for throats to cut.
She is known throughout the Royal Navy as the ‘Black Duke’ and she flies a black flag from her mainmast at all times.
Could she set sail again and raise her black flag, if only in our dreams?
He ordered and some men began hoisting down Robert's black flag with a cutlass and it was replaced with Simon's red flag with a skull over a time glass.
He looked out the porthole and saw the black flag with the silver bird and daggers emblazoned on it as it had always hung since his first days on deck, so many years ago.
2Motorsports A black flag used to signal a driver to make an immediate pit stop as punishment for violating a rule or driving dangerously, or to force inspection of a hazardous condition such as an oil leak.
Example sentencesExamples
Which driver was disqualified and banned for two races for ignoring a black flag in the 1994 British Grand Prix?
It was a relief that there were no penalty points for bad driving as I picked up three black flags - meaning a stop and go penalty in the pit lane - in as many laps.
Montoya is disqualified from the race after being given a black flag for a technical infringement relating to the incident in the start where he used the spare car.
Of course, I didn't want to pass him and get a black flag.
In the season-opening Australian Grand Prix two weeks ago, Coulthard took advantage of a black flag to Schumacher to win.