Learn how to say Concussions correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word concussion:
1 [mass noun] temporary unconsciousness or confusion and other symptoms caused by a blow on the head:
he was carried off the pitch with concussion
nothing more serious than a mild concussion
2a violent shock as from a heavy blow:
the ground shuddered with the concussion of the blast
late Middle English: from Latin concussio(n-), from the verb concutere ‘dash together, shake’ (see concuss)