walking out
/ˌwɔːkɪŋ ˈaʊt/noun
1The action of walking outside for recreation or exercise; specifically walking outside with a person of the opposite sex as a prelude to courting.
2The action of leaving a room, establishment, gathering, job, etc., sometimes as an act of protest.
Origin
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From walking + out. In some uses after to walk out.