脑震荡

脑震荡	nǎo zhèn dàng	(med.) cerebral concussion
脑	nǎo	brain / mind / head / essence
震	zhèn	to shake / to vibrate / to jolt / to quake / excited / shocked / one of the Eight Trigrams 八卦, symbolizing thunder / ☳
震荡	zhèn dàng	to shake up / to jolt / to vibrate / to oscillate / to fluctuate
震荡	zhèn dàng	to vibrate / to shake / to shudder
荡	dàng	variant of 荡
荡	dàng	to wash / to squander / to sweep away / to move / to shake / dissolute / pond