(v)thwart, queer, spoil, scotch, foil, cross, frustrate, baffle, bilkhinder or prevent (the efforts, plans, or desires) of“What ultimately frustrated every challenger was Ruth's amazing September surge”, “foil your opponent”
(s)economical, frugal, scotch, sparing, stintingavoiding waste“an economical meal”, “an economical shopper”, “a frugal farmer”, “a frugal lunch”, “a sparing father and a spending son”, “sparing in their use of heat and light”, “stinting in bestowing gifts”, “`scotch' is used only informally”