definition of
thwart

[1] #1 thwart v. [queer, spoil, scotch, foil, cross, frustrate, baffle, bilk] hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent". wn

[2] #2 thwart n. [cross thwart] a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat. wn