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Difference between Check someone up and Check up on someone

check someone up

1. (also: give someone a check-up) give smb. a medical examination:

  • The doctor checked me up and I was told I was in bad shape.

2. establish the truth about smb.; investigate a person:

  • The cop doesn’t even take the trouble to check me up, he knows me damn well.

check up on someone— = check someone 2:

  • The police checked up on him, and he had an alibi. Several people testified that they saw him at a bar in Rochester.