Webster's English Dictionary

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countersign

1. coun.ter.sign \-.si-n\ n 1: a signature attesting the authenticity of a 
   document already signed by a nother 2: a sign used in reply to another; 
   specif : a military secret sign al that must be given by one wishing to 
   pass a guard
2. countersign \.kau.nt-*r-'sig-n*-.chu.(*)r, -ch*r, -.t(y)u.(*)r\ vt 1: to 
   add one's signature to after another's to attest authenticity  2: CONFIRM, 
   CORROBORATE  - coun.ter.sig.na.ture n