Definition of "cruddle"

See how thy blood cruddles at this.

1612 January 5 (first performance, Gregorian calendar; published 1619), Francis Beaumont, John Fletcher, “A King, and No King”, in Comedies and Tragedies […], London: […] Humphrey Robinson, […], and for Humphrey Moseley […], published 1679, Act I, scene i

To prevent the Milk from cruddling, ſome Sugar may be mixed with it

1732, William Stephens, Dolӕus Upon the Cure of Gout by Milk-Diet