set (the) alarm bells ringing

if something sets alarm bells ringing, it makes you feel worried because it is a sign that there may be a problem.

Symptoms which should set alarm bells ringing are often ignored by doctors.

• roll over in grave
• roll over in someone's grave
• roll over something
• roll sleeves up
• roll up sleeves
• roll up your sleeves
• roll with it
• roll with the punches
• roll your sleeves up
• Rome wasn't built in a day.
• roof caves in
• roof falls in
• roof over head
• roof over your head
• room to swing a cat
• root and branch
• root-and-branch
• as a rule
• as as they come
• a saving grace
• as a whole
• as best as can
• as best as you can
• as best can
• as best you can