eclipse

dark age, nadir, sunset

decay, rotting, spoiling

breakup, crumbling, decomposition, disintegration, dissolution

abasement, debasement

depreciation, lessening

decimation, demolishment, demolition, desolation, destruction, havoc, ruin, ruination

abatement, decrease, decrement, de-escalation, deflation, diminishment, diminution, dip, downslide, downtrend, downturn, drop, drop-off, falloff, loss, lowering, reduction, sag, shrinkage, slip, slump

one-up, outpace, outrace, outrun, overpass

best, clobber, conquer, crush, defeat, drub, lick, master, outcompete, outperform, overcome, overmatch, prevail (over), rout, shame, skunk, subdue, surmount, thrash, trim, triumph (over), trounce, wallop, whip, win (against), worst

outbalance, outweigh, overbear, overshadow, trump