Definition of St Swithin’s Day noun from the Oxford Advanced Learner's Dictionary

 

St Swithin’s Day

 noun
noun
BrE BrE//ˌsnt ˈswɪðɪnz deɪ//
 
; NAmE NAmE//ˌseɪnt ˈswɪðɪnz deɪ//
 
 
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15 July, a Christian festival. In Britain it is said that if it rains on this day it will rain for the next forty days.