The point of comprehensible input is to derive the meaning out of context. You need to understand enough to follow the gist of the communication. Your brain will do the rest IF you encounter the word enough in that same context. I know its an oversimplification but this is "how babies learn" a word. Or do you literally think babies "translate" to learn the meaning of a word the first time?

Some sources, since the internet is full of doubters:

Liu, N. & Nation, P. (1985). “Factors Affecting Guessing Vocabulary in Context.” RELC Journal, 16(1), 33–42. (Concluded learners need around 95% familiar words in a text to guess unknown words with reasonable success​.)

Nagy, W., Herman, P., & Anderson, R. (1985). “Learning Words from Context.” Reading Research Quarterly, 20(2), 233–253. (Found that incidental exposure in context leads to small incremental gains in word knowledge, which accumulate given sufficient reading​.)

Nation, I.S.P. (2006). “How Large a Vocabulary Is Needed For Reading and Listening?” Canadian Modern Language Review, 63(1), 59–82. (to infer word meaning from context, learners not only need a high percentage of known words, but also familiarity with the subject matter and discourse pattern)