Meaning: ascertain

‚æsə'teɪn
v.
establish after a calculation, investigation, experiment, survey, or studybe careful or certain to do something; make certain of somethingfind out, learn, or determine with certainty, usually by making an inquiry or other effortlearn or discover with certainty

be a dead cert Idiom, Proverb

dead certain

very certain, very sure, positive He's dead certain that Ming is the man who talked to him.

for certain

without doubt, certainly, surely It is for certain that he will not be playing in the game tonight.

in no uncertain terms

definitely, clearly, call a spade a spade They told us about sex and drugs in no uncertain terms.

certain of

sure of 确信；自信
He is certain of winning the game．他确信会赢得这场比赛。
He felt quite certain of success．他对成功胸有成竹。

for a certainty certain

for sure；without doubt确定地；无疑地
Iknow it for a certainty that he'll get a promotion．我的确知道他将被提升。
I know for a certainty that he came from Shanghai．我确实知道他来自上海。
He left town a week ago， I know this for a certainty．他一星期前离开了这个城市，这一点我确实知道。
Do you know it for certain？你对这件事肯定知道吗？
I could not say for certain that he was wrong．我不能断然地说他错了。
I know for certain that he has come．我确实知道他来了。

for a certainty/for certain

for a for certain

make certain

make sure（of）弄清楚；确定
Make certain where we are going．弄清楚我们去哪儿。
Have you made certain of the time of the train？火车的时间你已弄清楚了吗？

make certain (of)

make sure（of）弄清楚；确定
Make certain where we are going．弄清楚我们去哪儿。
Have you made certain of the time of the train？火车的时间你已弄清楚了吗？

to a certain extent

somewhat在某种程度上
You are right to a certain extent．在某种程度上你是对的。

be a asleep cert

slang To be about assertive to do a assertive affair or to accomplish in a accurate area. Primarily heard in UK, Australia. Sally is the best able applicant by far, so she's a asleep absolutely for the promotion.Learn more: cert, dead

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More Idioms/Phrases

thrust into thrust through to a certain extent to a turn to all appearances to begin with to little/no purpose to little purpose be a (something) through and through be a (something) to (one's) fingertips be a barrel of laughs be a bed of nails be a bit much be a bit off be a bit steep be a bit/rather steep be a blessing in disguise be a box of birds be a bundle of laughs be a bundle of nerves be a card-carrying member (of something) be a chapter of accidents be a chip off the old block be a closed book be a cougar be a credit to be a credit to (someone or something) be a crock of shit be a crying shame be a cut above be a dab hand be a dab hand at be a dab hand at something/at doing something be a dead cert be a dead duck be a dead loss be a dead ringer for be a devil be a devil! be a different kettle of fish be a dime a dozen be a double-edged sword be a double-edged sword/weapon be a double-edged weapon be a drag on (one) be a fan of (someone or something) be a far cry from be a fate worse than death be a figment of (one's/the) imagination be a fine figure of a (man or woman) be a firm believer in (something) be a foil for (someone) be a foil to (someone) be a force to be reckoned with be a game of two halves be a ghost of (someone's or something's) former self be a go be a go-between be a goner