| 好古 | love of antiquities |
立ち稽古 立稽古 | rehearsal |
言い古す 言古す | to say repeatedly, to say proverbially |
| 往古より | from times immemorial, from ancient times |
| 亘古 | for ever, from ancient times |
| 古事記伝 | Commentary on the Kojiki (by Motoori Norinaga, 1798) |
| 古生界 | Paleozoic group |
| 古代裂れ | ancient cloth fragment |
| 稽古場 | training room (hall), gymnasium |
| 古書市 | secondhand book fair |
| 古書展 | exhibition of rare (old, antiquarian) books |
| 古墳時代 | Kofun period (of Japanese history, 250-538 CE), Tumulus period |
| 古代オリンピック | ancient Olympics |
| 着古し | old clothes, cast-off clothes |
| 古き良き時代 | the good old days, halcyon days |
古き良き日々 古きよき日々 | the good old days, halcyon days |
| 名古屋場所 | Nagoya (July) tournament |
| 横綱稽古 | practice session where grand champion is present |
| 山稽古 | outdoor practice |
| 三番稽古 | a row of training matches with the same opponent |
| 稽古場経費 | allowance paid by the Sumo Association to a coach for each wrestler in his stable |
ぶつかり稽古 打つかり稽古 | head-to-head training, drill consisting of pushing and being pushed, battering practice |
| 申し合い稽古 | training matches where the winner picks his next opponent |
| 懐古趣味 | nostalgia for the good old days, retro-culture |
| 古今独歩 | unsurpassed in history |
| 古今無双 | unparalleled in history |
| 千古不易 | eternally unchanging |
| 千古不滅 | everlasting, unchangeable, immortal |
| 万古不易 | eternally unchanging |
一人稽古 独り稽古 | practicing by oneself, self-instruction |
| 古武士然 | having something of the old-time samurai about one |
| 七十古希 | Men seldom live to be seventy (Du Fu (c.712-c.770)), Few people live to be seventy |
| 上古以来 | from (since) ancient times, from time immemorial |
| 千古万古 | remote antiquity, ancient times, the remote past |
| 千古不磨 | permanence, immortality, eternity |
| 東西古今 | all times and places, everywhen and everywhere |
| 名所古跡 | scenic sites and historic places, places of natural beauty and historic interest |
| 閑古鳥が鳴く | to be in a slump (of a business), (business is) slow |
| 古着屋 | somebody who sells second hand clothes |
古式ゆかしい 古式床しい | traditional |
| 蒙古症 | mongolism |
| 古細菌 | archaea, archaebacteria |
| 古糊 | aged paste, microbially fermented weak adhesive for restoration of Japanese works of art on paper |
| 古賀派 | Koga Faction (of the LDP) |
| 新古 | old and new (thing), old, but unused |
| 古層 | layers of history |
| 古書店 | antiquarian bookshop, store for rare and old books |