一か八か[ichikabachika] sink or swim
嘘っ八[usoppachi] downright lie
嘘っ八百[usoppappyaku] full of lies
嘘八百[usohappyaku] full of lies
八釜しい[kamabisushii] noisy

口八丁[kuchihacchou] voluble
三十八度線[sanjuuhachidosen] the Thirty-eighth Parallel
四苦八苦[shikuhakku] being in dire distress
四通八達[shitsuuhattatsu] traffic network extending in all directions
四方八方[shihouhappou] in all directions

咫尺[shiseki] very short distance
八咫の鏡[yatakagami] Yata no Kagami (the eight-span mirror; one of the Imperial regalia)
八咫[yaata] eight ata (approx. 144 cm)

八咫烏[yatagarasu] Yatagarasu (mythical raven who aided Emperor Jimmu on his eastern expedition)
八咫の烏[yatanokarasu] Yatagarasu (mythical raven who aided Emperor Jimmu on his eastern expedition)

ハッブル望遠鏡[habburubouenkyou] Hubble telescope
胃鏡[ikyou] gastroscope
遠眼鏡[toomegane] spectacles for far-sightedness
凹眼鏡[ougankyou] concave glasses
凹面鏡[oumenkyou] concave mirror

鏡像[kyouzou] reflected image
鏡台[kyoudai] dresser
鏡板[kagamiita] panel
鏡面[kyoumen] mirror surface