raise (some) eyebrows

to cause disapproval or worry.

The styles now favored by many teenagers have raised a few eyebrows among parents.

• be as black as you are is painted
• be as black as you it is painted
• be as blind as a bat
• be as bright as a button
• be as brown as a berry
• be as busy as a bee
• be as clean as a whistle
• be as clear as crystal
• be as clear as day
• be as clear as mud
• be as cold as ice
• be as cool as a cucumber
• be as crazy as they come
• be as [crazy/rich etc.] as they come
• be as cute as a button
• be as daft as a brush
• be as dead as a dodo
• be as dead as a doornail
• save your bacon
• save your breath
• save your own skin
• saving grace
• savoir-faire
• say a lot about
• say a lot about something