Source : Webster's Revised Unabridged Dictionary (1913)

Embank \Em*bank"\, v. t. [imp. & p. p. {Embanked}; p. pr. & vb.
   n. {Embanking}.] [Pref. em- + bank. Cf. {Imbank}.]
   To throw up a bank so as to confine or to defend; to protect
   by a bank of earth or stone.

Source : WordNet®

embank
     v : enclose with banks, as for support or protection; "The river
         was embanked with a dyke"