i Register
In some senses, downturn is marked as idiomatic. Watch for register when choosing this word.
ADJ
serious, severe, sharp, significant | mild, slight | economic
VERB + DOWNTURN
experience, suffer
Many small businesses suffered a significant downturn during the economic crisis last year.
see, witness
PREP
~ in
The company experienced a significant downturn in sales after the new competitor entered the market.