Go down, drop, etc. like ninepins
Definition 1 of 1
Pro Tip 1/3Figurative Use
The phrase is metaphorical and should not be taken literally; it refers to rapid and numerous failures or falls. 
When the stock market crashed, the prices went down like ninepins.
Pro Tip 2/3Origin Insight
Comes from bowling, where ninepins fall quickly when hit. Use the phrase to suggest a similar quick or sudden collapse. 
The company's sales went down like ninepins after the negative publicity.
Pro Tip 3/3Negative Connotation
Often implies negative outcomes, like illness or failure, occurring in quick succession or to many entities. 
During flu season, staff members were dropping like ninepins.