A proverb meaning that one is often unaware of what is close at hand; it's hard to see things that are right under your nose. Also stated as 'tōdai moto kurashi' (alternate spelling).
有名な店が近所にあると知らなかったなんて、まさに灯台下暗しだ。
Not knowing there's a famous shop in the neighborhood is truly a case of 'you can't see what's under the lamp'.
海外で自分の国の伝統が賞賛されるのを見て、灯台もと暗しを感じた。
Seeing my country's traditions admired abroad made me feel the truth of 'you can't see what's under the lamp'.
調べ物はネットばかりに頼らず、家の戸棚も確認してみて。灯台下暗しだよ。
Don't rely only on the internet for searching—check your cupboards at home too. It's often 'dark under the lamp'.