if you err on the side of caution when you are deciding what to do, you do the thing that is safe instead of taking a risk.

I decided to err on the side of caution and spend less than my full allowance.

• in the middle of something
• in the midst of
• in the midst of doing something
• in the midst of something
• in the money
• in the name of
• in the name of something
• in the neighborhood of
• in the neighborhood of something
• in the nick of time
• in the offing
• in the open
• in theory
• in the palm of hand
• in the palm of your hand
• in the picture
• in the pink
• in the pink of
• in the pink of something
• in the pipeline
• in the process of
• in the process of doing something
• in the public eye
• in the raw
• in the red