88 entries under expression topic. ×

12
at one time(adjective, idiom, adverb, late)
12
as soon as(conjunction, verb, phrasal verb, noun)
12
sometime(adjective, adverb, time, moment)
11
long ago(adjective, idiom, adverb, time)
11
one time(idiom, adverb, frequency)
10
sometimes(adverb, time, moment, period)
7
at times(idiom, adverb, time, moment)
7
in the past(verb, idiom, adverb, phrasal verb)
7
occasionally(adverb, time, moment, period)
6
on one occasion(adjective, idiom, adverb, past)
5
time was(adjective, adverb, late, old)
4
now and again(idiom, time, moment, rare)
4
on occasion(adverb, time, moment, period)
4
some time ago(idiom, adverb, late, earlier)
3
ages ago(adjective, adverb, late, old)
3
at once
3
in times past(adjective, idiom, adverb, past)
3
now and then(time, moment, rare, frequency)
3
one day(idiom, time)
3
one fine morning(idiom, time)
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APASmart Define. (2016). once thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/once/thesaurus/synonyms
ChicagoSmart Define. 2016. "once thesaurus" https://smartdefine.org/once/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, once thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/once/thesaurus/synonyms>.
MLASmart Define. "once thesaurus" 30 March 2016. Web. 21 September 2026. <https://smartdefine.org/once/thesaurus/synonyms>