(n.) Later or subsequent thought; as buy a gift as an afterthought\; reflection after an act.

PS Parthian shot about-face addendum afterthoughts appendix back matter better thoughts bind block blockage bureaucratic delay change of mind chorus coda codicil colophon conclusion consequence continuance continuation delay delayage delayed reaction detention developed thought double take dragging dying words envoi epilogue flip flip-flop follow-through follow-up halt hang-up hindrance holdup interim jam lag lagging last words logjam mature judgment mature thought moratorium obstruction paperasserie parting shot pause peroration postface postfix postlude postscript re-examination reappraisal reconsideration red tape red-tapeism red-tapery refrain reprieve respite retardance retardation rethinking revaluation reversal reverse review right-about right-about-face ripe idea second thought second thoughts sequel sequela sequelae sequelant sequent sequitur slow-up slowdown slowness stay stay of execution stop stoppage subscript suffix supplement suspension swan song tag tergiversating tergiversation tie-up time lag turnabout turnaround volte-face wait