on the safe side

on the safe side

Avoiding potential dangers, problems, or challenges; choosing a course of action less fraught with risk. I made an extra batch of brownies, just to be on the safe side in case we have more guests than we anticipated. We'd probably be fine with three cases, but I'd rather we have at least four to stay on the safe side.
See also: on, safe, side
Farlex Dictionary of Idioms.

on the safe side

Fig. taking the risk-free path. Let's be on the safe side and call first. I think you should stay on the safe side and call the doctor about this fever.
See also: on, safe, side
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on the safe side

Avoiding danger, with a margin for error, as in Just to be on the safe side, let's order another hundred chairs. This idiom was first recorded in 1811.
See also: on, safe, side
The American Heritage® Dictionary of Idioms by Christine Ammer.

on the safe side

mod. taking the risk-free path. Let’s be on the safe side and call first.
See also: on, safe, side
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • to be on the safe side
  • fraught
  • fraught with danger
  • bake
  • bake up
  • damn the torpedoes
  • damn the torpedoes, full steam ahead
  • torpedo
  • the lion's mouth
  • let George do it