天壤之别

1. • the difference between heaven and earth (idiom)

     lit.

2. • night and day difference a world of difference a far cry (from)

     fig.

Character by character

• 天(tiān)day
• 壤(rǎng)soil
• 之(zhī)(possessive particle, literary equivalent of 的 de)
• 别(bié)surname Bie