down·spin 
(dounspĭn′)
(dounspĭn′)n.
An extremely swift, acute downturn, as in market activity.
- autoradiogram
- autoradiograph
- autoradiographic
- autoradiography
- autoroute
- autos-da-fé
- autosomal
- autosomally
- autosome
- autostrada
- autosuggest
- autosuggestibility
- autosuggestible
- autosuggestion
- autosuggestive
- autotomic
- autotomize
- autotomous
- autotomy
- autotoxaemia
- autotoxemia
- autotoxic
- autotoxin
- autotransformer
- autotransplant