1.
When you ~ a letter or package, you send it somewhere by post.
He sent off copies to various people for them to read and make comments.
PHRASAL VERB: V P n (not pron), also V n P
2.
If a football player is sent off, the referee makes them leave the field during a game, as a punishment for seriously breaking the rules.
The 30-year-old Scottish international was sent off for arguing with a linesman.
PHRASAL VERB: usu passive, be V-ed P
see also sending-off