impression 

What were your first impressions of college?

Although she had only met the old man once， he had made an indelible impression on her.

take up

He did not particularly want to take up a competitive sport.

I hope that they take up this challenge.

constant 

Constant vigilance is necessary in order to avoid accidents.

Inflation is a constant threat.

flashback 

It was about an old man on his deathbed looking back on his life in flashback.

There is even a flashback to the murder itself.

previous 

She expressed agreement with the previous speaker.

She has a teenage daughter from a previous marriage.

guide 

Our 10-page guide will help you to change your life for the better.

We've arranged a walking tour of the city with your guide.

lack 

She put his failure to lack of experience.

Tom blames his lack of confidence on his mother.

lose sight of…

Never lose sight of the fact that requirements are only a means to an end.

The danger in all this is that investors lose sight of the risks to the value of internet companies.

sweep up

Get a broom and sweep up that glass will you?

I sweep up the pieces of his plate.

slide into

In order to ensure that the economy does not slide into a prolonged depression, we urge the MPC to reduce interest rates to almost zero in the next few months.

Is it possible to remember the slide into sleep or the hypnotist's fingers on your eyelids?

speed up

If you have such a processor you have certainly seen your programs speed up.

I have found a way to speed up this process.

instant 

You tell him what you want and expect instant results.

They were an instant sensation on the Internet.

desert 

Stop here to gas up before crossing the desert.

The engineers carried the railroad across the desert.

settlement 

We hope for a lasting settlement of all these troubles.

But after the settlement of theire differences, they became friends.