once in a blue moon

Другие идиомы:

• once and for all
• once in a while
• once in a lifetime
• once upon a time
• once or twice
• once-over
• one's bark is worse than one's bite
• on horseback
• one's tail between one's legs
• one's goose is cooked
• one's flesh and blood
• off one's back
• off one's chest
• on (someone's) back
• on (someone's) shoulders