欲置之死地而后方快: would be satisfied with nothing short of someone's destruction; in an attempt to finish it [sb.] off for good
不久: 1.(在不远的将来) soon; before long; near future 短语和例子水库不久就能完工。 the reservoir will soon be completed. 他不久就要出国去。 he'll go abroad very soon.2.(距离某件事情时间不远) soon after; shortly after; not long after