Third-person singular present form of 'concuss': to cause a concussion or violent shock to something.
From Latin 'concutere' (to shake together), combining 'con-' (together) and 'quatere' (to shake). The modern verb 'concuss' was formed from the Latin root, and 'concusses' is its standard third-person singular form.
The word 'concuss' is much more common in modern sports medicine discussions—we now talk about 'a collision that concusses a player,' making visible the injury that was once mysterious and unnamed!
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