See also: くしん, くじん, and ぐじん

Japanese

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For pronunciation and definitions of ぐしん – see the following entries.
具申
[noun] detailed statement, especially to one's superior
[verb] to state in detail, especially to one's superior; to present (an opinion); to report (a matter)
愚臣
[noun] (literally) stupid vassal
[pronoun] (archaic, humble) A first-person pronoun used by a vassal who humbles himself to his master.
(This term, ぐしん, is the hiragana spelling of the above terms.)

(The following entries are uncreated: 具臣, 供進, 愚身, 愚心.)