curb » curve
Spotted in the wild:
Brians: “A “curb” was originally a device used to control an unruly horse. Already in the 18th century people were speaking by analogy of controlling their appetites as “curbing” them. You do not “curve” your hunger, appetite, desires, etc. You curb them.”
Curb ‘control’ survives only in this metaphorical use, so it’s ripe for eggcorning.
(Suggested to me by Lee Rudolph.)