DICT.TW Dictionary Taiwan

 un·der·tow /-ˌto/
 從岸邊退回去的波浪;退波

 Un·der·tow n. Naut. The current that sets seaward near the bottom when waves are breaking upon the shore.
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 undertow
      n 1: an inclination contrary to the strongest or prevailing
           feeling; "his account had a poignant undertow of regret"
      2: the seaward undercurrent created after waves have broken on
         the shore [syn: sea puss, sea-puss, sea purse, sea-purse,
          sea-poose]