dig/dip into (your) pocket

to use your own money to pay for something.

Parents of young children have to dig deep into their pockets at Christmas-time.

• open the door to
• 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