coun·ter·sign /-ˌsaɪn/
 口令,暗號,副印(vt.)副署,連署,確認
 Coun·ter·sign v. t. [imp. & p. p. Countersigned p. pr. & vb. n. Countersigning.]  To sign on the opposite side of (an instrument or writing); hence, to sign in addition to the signature of a principal or superior, in order to attest the authenticity of a writing.
 Coun·ter·sign, a.
 1. The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity.
 2. Mil. A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword.
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 countersign
      n 1: a secret word or phrase known only to a restricted group;
           "he forgot the password" [syn: password, watchword,
           word, parole]
      2: a second confirming signature endorsing a document already
         signed [syn: countersignature]
      v : add one's signature to after another's to attest
          authenticity; "You must countersign on this line of the
          contract"