We found one dictionary that defines the word spiral down/downward:

General (1 matching dictionary)

1. spiral down/downward: Oxford Learner's Dictionaries

▸ Words similar to spiral down/downward ▸ Usage examples for spiral down/downward ▸ Idioms related to spiral down/downward ▸ Wikipedia articles (New!) ▸ Words that often appear near spiral down/downward ▸ Rhymes of spiral down/downward ▸ Invented words related to spiral down/downward