1. To push the envelope

To innovate, To do sth new that goes beyond what was thought to be possible

Example: His new website really pushes the envelope of what the Internet can be used for.

2. To abide by the rules

To accept and follow the rules

Example: Both companies claim the right to sell the product, but they will abide by the judge’s decision.

3. To carry on doing sth

To continue

Example: They will carry on with the grammar lessons until they pass the test.

4. To test the waters

To check the likelihood of success before proceeding

Example: Before starting the research, the scientists tested the waters by administering their experiments on a few subjects.

5. To pan out

To turn out well, to yield good results

Example: I have had several interviews for job but nothing has panned out yet.

6. To account for a discrepancy

To explain

Example: The police asked him to account for the missing money.

7. To give away the ending

To reveal (sth that was supposed to be kept secret)

Example: It was supposed to be a surprise party but our little sister gave it away.

8. To follow suit

To do the same, to follow the example set by someone else

Example: He decided to skip the class and the rest of the gang followed suit.

9. To grow out of something

To outgrow 

Example: She gives her son’s clothes to charity when he grows out of them.

2. To develop on the basis of sth

Example: This book grew out of a series of lectures.

10. To know the ropes

To understand how things are done in a particular place

Example: To succeed in a new job, ask someone who really knows the ropes to train you