What's the difference between shirl and thirl?

Shirl

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Definition:

• (a.) Shrill.
• (n.) See Schorl.

Example Sentences:

• (1) Among older friends and colleagues, she is known simply as "Shirl the Pearl" – a term that carries with it affection and also huge respect.

Thirl

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Definition:

• (v. t.) To bore; to drill or thrill. See Thrill.

Example Sentences: