What's the difference between cruddle and ruddle?

Cruddle

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Definition:

• (v. i.) To curdle.

Example Sentences:

Ruddle

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Definition:

• (v. t.) To raddle or twist.
• (n.) A riddle or sieve.
• (n.) A species of red earth colored by iron sesquioxide; red ocher.
• (v. t.) To mark with ruddle; to raddle; to rouge.

Example Sentences:

• (1) These assignments are consistent with published data (Ruddle, 1973).