“Before one knows it” in Japanese
Short answer
Before one knows it in Japanese is “知らぬ間に” (shiranumani). Full meaning: before one knows it, before one realises, without one's knowledge, without noticing.
Other ways to say “Before one knows it” in Japanese
知らない間に
shiranaiaidani before one knows it, before one realises, without one's knowledge, without noticing
知らないうちに
shiranaiuchini before one knows it, before one realises, without one's knowledge, without noticing
いつの間にやら
itsunomaniyara before one knows it, without realizing, unawares, unnoticed
Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.