English Idioms

The idiom 'it's high time' is used to express that something should have happened already and is long overdue. It emphasizes that action is urgently needed now.

The phrase 'for the time being' means for the present moment or temporarily. It indicates a situation that is expected to change in the future.

The phrase 'on the double' is an idiom meaning to do something very quickly or immediately. It originates from military terminology for marching at twice the normal speed.

Something that happens "out of the blue" occurs completely unexpectedly and suddenly, like a sudden lightning bolt from a clear blue sky. The other options, such as "from time to time" or "fast," do not capture this element of surprise.

A "blue moon" is a relatively rare astronomical event, so the idiom "once in a blue moon" refers to something that happens very rarely or almost never. It does not mean suddenly or periodically.