Diet \Di"et\, v. t. [imp. & p. p. {Dieted}; p. pr. & vb. n. {Dieting}.] 1. To cause to take food; to feed. [R.] --Shak. [1913 Webster] 2. To cause to eat and drink sparingly, or by prescribed rules; to regulate medicinally the food of. [1913 Webster] She diets him with fasting every day. --Spenser. [1913 Webster]