pigeonhole

今日の単語もまだHUCKLEBERRY FINNのINTRODUCTIONからです。
After reaching the 'bottom of Illinois' there was nothing, logically, to do but to go back; and this is what Twain remembered to say they would do after Cairo was overshot, before he pigeonholed the manuscript in 1876.
鳩の穴が動詞になるとどう言う意味になるのでしょうか？　カッバドキアに鳩の巣の谷があったのを思い出しました。　そう言えば東京にも鳩の巣渓谷がありますね。　とにかく辞書を引きます。
・OneLook Quick Definitions: 1. treat or classify according to a mental stereotype 2. place into a small compartment
・Dictionary.com: 1. to assign to a definite place or to definite places in some orderly system: to pigeonhole new ideas. 2.to lay aside for use or reference at some later, indefinite time: We must pigeonhole this excellent plan until the time is ripe. 3. to put aside for the present, esp. with the intention of ignoring or forgetting, often indefinitely: to pigeonhole an unwanted invitation. 4.to place in or as if in a pigeonhole or pigeonholes: to pigeonhole papers.
なるほど、物を箱などに入れて整理する事から生まれた単語ですね。