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

嘘っぱち[usoppachi] downright lie
嘘っ八百[usoppappyaku] full of lies
嘘でかためる[usodekatameru] to fabricate a web of lies
嘘を付く[usowotsuku] to tell a lie
嘘字[usoji] incorrect character

嘘付き[usotsuki] liar (sometimes said with not much seriousness)
嘘八百[usohappyaku] full of lies
大嘘[oouso] big lie
嘘ぶく[usobuku] to exaggerate