get up against so or sth meaning

[American slang]
to press close against someone or something.
  I got up against the wall, out of the way.
  The child got up against his father to stay warm.

• up against so or sth:    [American slang]in ...
• brush (up) against so or sth:    [American slang]to ...
• bump (up) against so or sth:    [American slang]to ...