for certainCERTAINLY/DEFINITELYwithout doubt 确定,无疑 SYN for sureknow/say (something) for certain I know for certain it’s in here somewhere. 我能肯定它就在这里的某个地方。
that’s/one thing’s for certain One thing’s for certain, he won’t be back. 有一点可以肯定,他是不会回来了。
know/say (something) for certain• I didn't really know this for certain.
→ for certain at certain1(2)