COLLOCATIONS
calm sea, calm voice, stay calm, calm down, dead calm
WORD FORMSPast: calmed | Past participle: calmed | Gerund: calming | Comparative: calmer | Superlative: calmestUSAGE NOTES
As an adjective, 'calm' describes a state of being. As a verb, it is often used with 'down' (e.g., 'calm down').