regurgitation
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
The passive retrograde flow of gastric contents into the pharynx, risking aspiration under anaesthesia.
Silent regurgitation is especially perilous because it may soil the airway without any warning cough.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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