'to send away for' something means to write to an organization to have something delivered to you.
- I couldn't find it in the local shops. I had to send away for it.
- I don't know what they are like. I'm going to send away for some samples.
'to send back' means to return something because it is not right or damaged.
- The food was cold when it was served so we sent it back.
- When it arrived, I didn't like the colour so I sent it back.
'to send for' means to send a message asking someone to come to see you
- The baby was very ill so she sent for the doctor.
- I knew I was in trouble when the boss sent for me.
'to send in' means to send something to an organization.
- Please send in the completed forms before January 31st.
- The TV show is funny family videos that viewers send in.
'to send someone in' means to tell a person to enter a room or office.
- I'd like to speak to James. Can you send him in, please?
- I'm ready now. Can you send in the first patient?
'to send off' means to post a letter or parcel.
- You should have got it by now. I sent it off two days ago.
- I packed everything up and sent it off last week.
'to send on' means to forward a document or mail.
- Here is my new address. Can you send my mail on to me?
- My colleague is dealing with this. I'll send a copy of your email on so she can deal with it.
'to send out' means to send to a lot of people at the same time.
- The wedding is in two months. We need to send out the invitations.
- We sent out copies of the new brochure to all our existing clients.
'to send out' also means to emit a sound or light.
- This tiny transmitter sends out a signal strong enough to be picked up a kilometre away.
- The phone mast sends out radio waves that some people think are dangerous.
'to send out for' means to phone an order to a restaurant for food to be delivered
- I don't want to cook. Let's send out for a pizza.
- It's almost lunchtime. Shall we send out for some sandwiches or snack.