wig·wag /ˈwɪgˌwæg/
  (vt.)(vi.)搖擺,揮,搖,發信號旗子信號,手光信號
  Wig·wag v. i.  Naut. To signal by means of a flag waved from side to side according to a code adopted for the purpose.  [Colloq.]
  Wig·wag v. t. & i.  [imp. & p. p. Wigwagged p. pr. & vb. n. Wigwagging ] To move to and fro, to wag.
  Wig·wag, n.  Act or art of wigwagging; a message wigwagged; -- chiefly attributive; as, the wigwag code. -- Wig*wag*er n.
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  wigwag
       v 1: send a signal by waving a flag or a light according to a
            certain code
       2: signal by or as if by a flag or light waved according to a
          code
       [also: wigwagging, wigwagged]