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plunge slide sliding slippage sphacelate submergence suppurate tip toboggan tobogganing topple skid sink putrefy rafting regress retrocede retrograde retrogress rotted rot sagged shrink tumble tumble-down knock over tip over biodegrade downsize de-escalate tear down dry-rot taper off nose dive nosedive knock down drop away ulcerate undermine upend wither die away misaddress bastardise sideslip denature oxidise fade away plummet abbreviate