send someone away—
1. make a person leave:
- I sent him away because I was tired of his idle chatter.
2. dismiss smb. from employment:
- News spread round that the teacher has been sent away on account of immoral behavior.
send someone off—
1. start smb. on a journey, etc.:
- Mother always makes sure the children are sent off with a good breakfast inside them.
2. bid a person farewell; say goodbye:
- The whole family arrived on the quayside to send him off.
3. (Sport) order a player to leave the field:
- Now don’t you try arguing with the referee. You’ll only get sent off.
4. make a person fall asleep:
- Did you know that if you count sheep, it is watching the sheep jump that sends you off?