turn your back on

1 抛弃

abandonment desert abandon dump scrap discard ditch chuck forsake unlearn jilt deep-six chuck away chuck out throw overboard get out of give up throw away walk out cast aside walk out on slough off reject toss junk forgo jettison divest yourself of boot out shuck off out the window turn against run out on

2 拒绝帮助

hold out on

3 对…置之不理

let it lie sweep aside wave aside brush aside tune out

4 背弃

break lapse

5 不再参与

lapsed out of butt out