1	to leave someone, especially someone you are responsible for How could she abandon her own child?

2	to go away from a place, vehicle etc permanently, especially because the situation makes it impossible for you to stay - synonym leave We had to abandon the car and walk the rest of the way. Fearing further attacks, most of the population had abandoned the city.

3	to stop doing something because there are too many problems and it is impossible to continue The game had to be abandoned due to bad weather. They abandoned their attempt to recapture the castle. Because of the fog they abandoned their idea of driving.

4	to stop having a particular idea, belief, or attitude They were accused of abandoning their socialist principles. Rescuers had abandoned all hope of finding any more survivors.

5	abandon yourself to something literary to feel an emotion so strongly that you let it control you completely She abandoned herself to grief.