1
trial and error(noun, expression, idiom, check, approval)
1
trial run(noun, expression, check, approval, examination)
1
try(noun, check, approval, examination, standard)
1
verification(noun, check, approval, examination, standard)
1
walk-up(noun, approach, kickoff, warm-up, lead-in)
1
windup(noun, regression)
1
yardstick(noun, check, approval, examination, standard)
1
zero hour(noun, expression, idiom, moment)
0
quiz(noun, check, approval, examination, standard)
0
confirmation(noun, check, approval, examination, standard)
0
curtain lifter(noun, expression, approach, kickoff, warm-up)
0
curtain raiser(noun, expression, idiom, event)
0
formula
0
start(noun, beginning, opening, birth, onset)
0
test(noun, check, examination, trial, quiz)
0
A-day
0
D-day
0
H-hour
0
alpha(noun, start, beginning, opening, birth)
0
appointed hour
13 years ago|9.5k views|share |citing 
APASmart Define. (2013). countdown thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/countdown/thesaurus/synonyms
ChicagoSmart Define. 2013. "countdown thesaurus" https://smartdefine.org/countdown/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, countdown thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/countdown/thesaurus/synonyms>.
MLASmart Define. "countdown thesaurus" 17 June 2013. Web. 21 September 2026. <https://smartdefine.org/countdown/thesaurus/synonyms>