Bend inward
131in|cur|va|ture — «ihn KUR vuh chuhr», noun. a curving inward; inward curve or bend …
132Sinuate — Sin u*ate, a. [L. sinuatus, p. p. of sinuare to wind, bend, fr. sinus a bend.] Having the margin alternately curved inward and outward; having rounded lobes separated by rounded sinuses; sinuous; wavy. [1913 Webster] …
