십중팔구가 · 십중팔구를 (mostly used as an adverb)
most likely, nine times out of ten
Example
이렇게 막히면 십중팔구 늦을 거예요.
If traffic is this bad, we'll almost certainly be late.
Word parts
십 ten+중 among+팔 eight+구 nine
Literally 'eight or nine out of ten'.
Related words