S: (v) thwart, 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"
S: (v) bilk (evade payment to) "He bilked his creditors"
S: (v) elude, evade, bilk (escape, either physically or mentally) "The thief eluded the police"; "This difficult idea seems to evade her"; "The event evades explanation"