Curdle \Cur"dle\ (k[^u]r"d'l), v. i. [From {Curd}.] [Sometimes written {crudle} and {cruddle}.] 1. To change into curd; to coagulate; as, rennet causes milk to curdle. --Thomson.
2. To thicken; to congeal.
Then Mary could feel her heart's blood curdle cold. --Southey.
Curdle \Cur"dle\, v. t. [imp. & p. p. {Curdled} (-d'ld); p. pr. & vb. n. {Curdling} (-dl[i^]ng).] 1. To change into curd; to cause to coagulate. ``To curdle whites of eggs'' --Boyle.