‘Once in a blue moon’ – an event that happens infrequently.
“I only go to the cinema once in a blue moon.”
‘When pigs fly’ – something that will never happen.
“When pigs fly she’ll tidy up her room.”
‘Once in a blue moon’ – an event that happens infrequently.
“I only go to the cinema once in a blue moon.”
‘When pigs fly’ – something that will never happen.
“When pigs fly she’ll tidy up her room.”