singularity

lose *one's heart to / give *oneself up to / be addicted to

concealment / conceal oneself / be inactive / lie behind / being inactive / lying behind / concealing oneself / hiding / be latent / hide out / lie hidden / being hidden / keeping a low profile / hiding out / being in hiding / lying hidden / lurking in / lurk in / be in hiding / keep a low profile / be hidden

go down to the bottom

sink low / be ruined

short stay / stay [somewhere] for a while

be utterly defeated / be routed

be wasted

look back upon / reminisce / recall / review / recollect / go over the past in *one's mind / retrospect

retrospect / reminisce / recollect