A concussion happens when the brain is shaken, often in a car crash or a fall or a strike to the head in sports.

VOA: special.2009.10.28

In Genesis 3:15, God says to the snake: "I will put enmity Between you and the woman, ; And between your offspring and hers; They shall strike at your head, And you shall strike at their heel."

创世纪》第三章第十五节，耶和华对蛇说：,我要叫你和女人,彼此为敌，你的后裔与女人的后裔也彼此为敌;,她们要伤你的头，你将伤她们的脚跟“

耶鲁公开课 - 旧约导论课程节选

After months of growing tension, the head of the company sent three hundred private security officers to break up the strike and protect non-union workers.

VOA: special.2010.06.10

One poor girl was reportedly killed when a firecracker underneath a manhole cover made it fly up and strike her head (some explosive power, that).

CNN: ASIANOW - TIME Asia | Asia Buzz: Firecracker Freedom

Crouch, who Redknapp publicly backed after his sending off in the Bernabeu, was perfectly placed to head in strike-partner Roman Pavlyuchenko's cross following a short corner.

BBC: Tottenham 3-2 Stoke

The National Union of Teachers and the Association of Teachers and Lecturers have already voted for strike action over pensions, as has the National Association of Head Teachers - in the first strike call in its history.

BBC: Teachers in NASUWT vote for strike over pensions