"When pigs fly" İfadesinin Anlamı
When pigs fly
Idiom 
Used to describe something that will never happen or is highly unlikely.
Anlamlar
1. asla
2. hiçbir zaman
3. imkansız
Örnekler
“He’ll apologize when pigs fly.”
“O, asla özür dilemez.”
“I’ll go bungee jumping when pigs fly.”
“Ben asla bungee jumping yapmam.”
“She said she’ll lend me money when pigs fly.”
“O bana asla para vermez dedi.”