see somebody/something ↔ off phrasal verb ( see also ↑ see )
1 . to defeat someone or stop them from competing against you:
To see off the threat, the company will have to cut its prices still further.
The team saw off their old rivals in last night’s championship game.
2 . to go to an airport, train station etc to say goodbye to someone:
They’ve gone to the airport to see their son off.
3 . ( also see somebody off something ) to force someone to leave a place:
Security guards saw him off the premises.