What's the difference between overbrow and overcrow?

Overbrow

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Definition:

• (v. t.) To hang over like a brow; to impend over.

Example Sentences:

Overcrow

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Definition:

• (v. t.) To crow, exult, or boast, over; to overpower.

Example Sentences:

• (1) A correlation was found between burn and scald accidents and New Commonwealth immigrants and overcrowing.
• (2) A cytopathogenic effect is noticed in the cultured cells overcrowed with germs.