WordNet (r) 3.0 (2006):

double take
    n 1: a delayed reaction indicating surprise

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "double take":
   PS, Parthian shot, addendum, afterthought, appendix, back matter,
   bind, block, blockage, bureaucratic delay, chorus, coda, codicil,
   colophon, conclusion, consequence, continuance, continuation,
   delay, delayage, delayed reaction, detention, dragging,
   dying words, envoi, epilogue, follow-through, follow-up, halt,
   hang-up, hindrance, holdup, interim, jam, lag, lagging, last words,
   logjam, moratorium, obstruction, paperasserie, parting shot, pause,
   peroration, postface, postfix, postlude, postscript, red tape,
   red-tapeism, red-tapery, refrain, reprieve, respite, retardance,
   retardation, second thought, sequel, sequela, sequelae, sequelant,
   sequent, sequitur, slow-up, slowdown, slowness, stay,
   stay of execution, stop, stoppage, subscript, suffix, supplement,
   suspension, swan song, tag, tie-up, time lag, wait