The phrase "side entrance" refers to a door or entrance that is not located at the front or main part of a building, but rather on the side. Full definition
There is also a private side entrance for access to small fenced yard and patio. (zillow.com)
You will have to get to your things through the side, and sometimes your larger items may not fit via side entrance. (stroller-envy.com)
Our new honeymoon and king suites are located on our new level which can be accessed from an internal lift or through a private side entrance. (lavenderhousebythesea.com)