1. abandon or leave somebody or something
walk out on your partner/job
To 'walk out on somebody' means to leave or abandon them. Usually, this phrase is used to talk about someone leaving a romantic relationship or their family. This is a casual expression used more often in social contexts. Similar meaning expressions include 'to abandonn', 'to desert' or 'to leave high and dry'. Do not confuse with the phrasal verb 'walk out' which means to leave angrily.