old-fashioned

something that you say which means eating an apple every day will keep you healthy.

If 'an apple a day keeps the doctor away,' then why have I got this terrible cold?

• open the door to something
• open the floodgates
• open the way for
• open the way for something
• open the way to
• open the way to something
• open to
• open to something
• open up
• open up a can of worms
• open up something
• open your eyes
• open your eyes to
• open your eyes to something
• open your heart
• open your mouth
• operative word
• order of the day
• or else
• other day
• other half
• other side of the coin
• other side of the tracks
• other than
• other things being equal