open up

open up  {v.}

1. To show for the first time; make clear; reveal.

The story of Helen Keller's life opened up a whole new world to Mary.

Einstein's theories opened up a whole new area for study.

2. To make available; present an opportunity; offer.

The building of the railroad opened up new lands to the pioneers.

John opened up a whole new section of the Scrabble board.

3.  {informal}

To go faster.

When they got out on the highway John opened up and drove at 65 miles per hour.

4.  {informal}

To begin to shoot.

When they got close to the enemy lines, they opened up with all they had.

5.  {informal}

To begin to talk frankly.

After John learned to trust Mr. Jones, he opened up and told him how he felt.

6. To spread out.

After a while the road opened up and they traveled more quickly.

7. To become available.