S: (v) change state, turn (undergo a transformation or a change of position or action) "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"
S: (v) change (undergo a change; become different in essence; losing one's or its original nature) "She changed completely as she grew older"; "The weather changed last night"
W: (n) slippage [Related to: slip] (decline from a standard level of performance or achievement)
W: (n) drop-off [Related to: drop off] (a noticeable deterioration in performance or quality) "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality"