Crossword Genius

Shook with cold three times as much around start of March (8)

Ross

I believe the answer is:

trembled

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'shook' is the definition.
(trembling is a kind of shaking)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for trembled that I've seen before include "Shook from fear or cold" , "shivered" , "Shook involuntarily" .)

I've seen this clue in The Telegraph.
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