The difference between Slip of the pen and Slip of the tongue
When used as nouns, slip of the pen means a mistake in handwriting, whereas slip of the tongue means a mistake in speech.
check bellow for the other definitions of Slip of the pen and Slip of the tongue
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Slip of the pen as a noun (idiomatic):
A mistake in handwriting.
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Slip of the tongue as a noun (idiomatic):
A mistake in speech.
Examples:
"It was an unfortunate slip of the tongue, and he did not intend it that way."