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If an event is held no matter whether it rains or the sun shines, it's a "rain or shine" event. Some people say it's raining "cats and dogs" when it's raining very heavily.

These idiomatic expressions "rain or shine" and "cats and dogs" are often called binomial pairs. They are common English phrases that include a pair of words usually joined by "and" or "or". The order of the words are fixed. They're not reversible. In other words, you always say "rain or shine" and not "shine or rain".

Some binomials can be formed by joining two related words, such as "nuts and bolts", "leaps and bounds", "peace and quiet". Others by joining two opposite words, for example, "ups and downs", "love and hate", "more or less".

And you may want to remember one of the best ways to improve your English fluency is to learn this sort of idiomatic expressions.

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