(just) to be on the safe side

so that you can prevent something unpleasant from happening.

Just to be on the safe side, ask your doctor to test your iron levels.

• sleep around
• sleep a wink
• sleeping partner
• sleep like a log
• sleep like a top
• sleep off
• sleep on it
• sleep over
• sleep something off
• sleep with
• sleep with someone
• sleight of hand
• slice of life
• slice of the action
• slice of the cake
• slime ball
• Sling hook!
• sling mud at
• sling mud at someone
• slings and arrows
• slings and arrows of outrageous fortune
• Sling your hook!
• slip away
• slip into
• slip into something