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Dictionary.com
Definitions

make sure

VERB
ascertain
Synonyms
STRONGEST
confirm determine divine double-check find out verify
STRONG
check dig discover establish eye eyeball fix identify learn peg read see settle size tell
WEAK
catch on check out check up on get down cold get down pat get hold of get it down get the hang of learn the ropes make certain pick up pick up on size up
Antonyms
STRONGEST
disprove invalidate
STRONG
aid assist confuse destroy help ignore look away miss misunderstand neglect overlook unsettle
VERB
assure
Synonyms
STRONGEST
confirm ensure guarantee insure secure
STRONG
cinch clinch complete ice lock seal set
WEAK
have a lock on lock on lock up nail down put on ice
Antonyms
STRONG
halt
VERB
check
Synonyms
STRONGEST
analyze confirm correct find out go through investigate look at monitor probe review scrutinize study test try verify
STRONG
ascertain audit candle case compare count eyeball frisk note overlook prove quiz tell
WEAK
balance account enquire about keep account look over scout out take stock
Antonyms
STRONGEST
disregard ignore neglect overlook
STRONG
estimate guess
WEAK
forget invalidate
VERB
confirm
Synonyms
STRONGEST
affirm approve back certify corroborate endorse establish explain sign substantiate support uphold verify
STRONG
attest authenticate bless buy check circumstantiate debunk double-check justify okay sanction settle subscribe underpin vouch warrant witness
WEAK
bear out check out give green light give high sign give stamp of approval give the go-ahead give the nod lap up make good rubber-stamp sign off on size up thumbs-up
Antonyms
STRONGEST
confuse contradict deny disallow disapprove discredit disprove invalidate oppose refuse reject
STRONG
disagree refute veto
WEAK
annul cancel destroy repudiate void
VERB
ensure
Synonyms
STRONGEST
assure establish insure protect provide safeguard secure
STRONG
arrange certify cinch clinch confirm effect guard okay warrant
WEAK
lock on lock up make certain make safe nail down put on ice set out
Antonyms
STRONGEST
endanger harm hurt injure
STRONG
contradict deny forget ignore invalidate neglect reject repudiate veto
VERB
follow up
Synonyms
WEAK
check out find out about investigate look into pursue
Antonyms
WEAK
avoid dodge forget
VERB
guarantee
Synonyms
STRONGEST
assure ensure insure maintain protect prove secure support
STRONG
affirm angel attest aver back bankroll certify confirm cosign endorse evidence evince grubstake guaranty juice mortgage reassure stake swear testify wager warrant witness
WEAK
answer for be surety for bind oneself get behind give bond make bail make certain pick up the check pick up the tab sign for stand behind stand up for vouch for
Antonyms
STRONGEST
harm hurt injure let go neglect
STRONG
contradict deny discourage disprove invalidate oppose refute reject repudiate veto
WEAK
break
VERB
secure
Synonyms
STRONGEST
achieve assure buy capture ensure gain get guarantee have insure take win
STRONG
access acquire annex bag catch cinch grasp hook land lock procure
WEAK
chalk up come by get hold of lock up pick up rack up
Antonyms
STRONGEST
forfeit lose miss
STRONG
let go release
WEAK
give up
VERB
verify
Synonyms
STRONGEST
authenticate certify check corroborate demonstrate double-check establish find out justify prove substantiate
STRONG
attest debunk document eye eyeball peg settle size support test try
WEAK
add up bear out check out check up check up on hold up make certain pan out size up stand up
Antonyms
STRONGEST
conceal confuse contradict deny discredit disprove hide invalidate reject

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.

“Intermediaries are still working hard behind the scenes to make sure that both sides continue to communicate,” the senior economist says.

From The Wall Street Journal • Apr. 15, 2026

“We want to make sure that we do this in a way that is orderly for everybody, and people can understand what’s expected,” Fuhrer said.

From The Wall Street Journal • Apr. 14, 2026

I got in there the idea of a strain with the Lakers, but I wanted to make sure to not defile that relationship based upon certain things that I wasn’t going to dig into.

From Los Angeles Times • Apr. 14, 2026

“You need to make sure that you’ll be able to make those payments for the full length of the policy,” says Morgan & Morgan, a law firm with offices nationwide.

From MarketWatch • Apr. 14, 2026

No way to make sure -the mud was swirling thick around him, and he couldn’t risk opening his fist in case they slipped free -but he could feel the weight of them dragging him down.

From "Wolf Brother" by Michelle Paver