Definition of slip of the pen or the tongue in English:

slip of the pen (or the tongue)

A minor mistake in writing (or speech).
More example sentences
  • Minor slips of the tongue merely reminded me of the live nature of the performance.
  • A slip of the tongue, or some random twitch in an otherwise foolproof plan, blows his cover.
  • Those minor slips of the tongue are quite embarrassing.
See parent entry: slip

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cause (someone) to lose confidence or hope