rain cats and dogs

Từ điển WordNet v3.1 - WordNet Dictionary

verb

rain heavily
- Put on your rain coat-- it's pouring outside!
• Syn:
pour, pelt, stream, rain buckets
• Derivationally related forms:
pelter (for: pelt)
• Hypernyms:
rain, rain down
• Hyponyms:
sheet, sluice, sluice down
• Verb Frames:
- It is ----ing
- It was rain cats and dogsing all day long