Phrasal verbs are an important feature of the English language. The meaning of a phrasal verb often bears no relation to the meaning of either the verb or the particle which is used with it. Many phrasal verbs have several different meanings.
See off (to go to the place that someone is leaving from in order to say goodbye)
My wife and two children came to the airport to see me off.
See out (to go with someone to the door of a room or building when they are leaving)
My son will see you out.
See through (if you see through someone who is trying to deceive you, you realise what they are really like)
He told me he was a high official in a Ministry, but I saw through him at once.
See to (to deal with something that needs doing or to help someone who needs your help)
Please see to it that no one enters my room without permission.
Seek out (to look for someone or something for a long time until you find them)
Many people are now seeking out Ayurvedic treatment.
Seize upon (to use something in an enthusiastic way because it will help you or give you an advantage)
You should seize upon every new opportunity to improve your talents.
Seize up (if part of your body seizes up, it stops moving in the normal way)
Her right leg suddenly seized up during the race.
Sell off (to sell all or part of a business)
The company is going to sell off some of its buildings.
Sell out (if a shop sells out something, it has no more of it)
All the bookshops have sold out the new edition of the Oxford Dictionary.
Send back (to return something to the company you bought it from)
Some pages of the dictionary were missing and I sent it back to the bookshop.
Send for (to send someone a message asking them to come to see you)
Her condition is serious, send for the doctor at once.
Send in (to send a group of people with special skills to deal with a difficult situation)
The Government will send in a medical team to deal with the epidemic.
Send off (to send a letter, document or parcel by post)
You have to send off the application today.
Send on (to send a document to another person)
If you are interested in the article, I can send it on to you.
Send out (to send something to a lot of different people at the same time)
We are sending out all the invitations today.
Separate off (to remove something from a large group of things)
The rotten tomatoes were separated off from the rest.
Separate out (to divide a group of people into smaller groups)
The children were separated out into four small groups.
Serve for (to be used for a particular purpose, often because there is nothing else more suitable)
Her umbrella will serve for a weapon, should the occasion arise.
Serve out (to continue doing something until the end of a fixed period of time)
The prisoner served out his seven-year sentence.
Serve up (to put food on plates and dishes for people to eat)
They are going to serve up the food now.
Set about (to start doing something, especially something that uses a lot of time or energy)
I returned home and set about cleaning the kitchen.
Set against (to be opposed to doing or having something)
Public opinion is set against the proposed Constitutional Amendment.