fill in
[fil-in]
/ ˈfɪlˌɪn /
VERB
answer in writing
Synonyms
Antonyms
WEAK
leave blank
VERB
act as substitute
Synonyms
STRONGEST
WEAK
deputize
insinuate
interject
interpose
pinch hit
represent
stand in (for)
substract
take the place of
understudy
Antonyms
WEAK
leave blank
NOUN
substitute
Synonyms
fill-in
NOUN
substitute
Synonyms
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“This has shifted new unit expansion more towards ‘fill-in’ activity within the U.S., essentially siphoning sales from high-volume locations and resulting in a lesser amount of new member sign-ups for new clubs,” he continued.
From MarketWatch • Jan. 5, 2026
