Elope, traditionally, means to run away or abandon family to marry. Although the word is also used by workers and nurses at psychiatric institutions (asylums, mental wards, sanatorium, etc.) to describe the a patient trying to escape.
Nurse: Sir, we seem to be missing one of our more violent patients, I believe he is trying to elope.
Director: Verywell, call the guards and get me the governorphone number.