1. past tense of impeach: to formally charge a public official with misconduct in office
Usage: political/legal context
2. past tense of impeach: to call into question or challenge the credibility of something
Usage: formal

Examples

• The president was impeached by the House of Representatives.
• Two U.S. presidents have been impeached in history.
• The governor was impeached for corruption charges.
• The lawyer impeached the witness’s testimony.
• His credibility was impeached by the contradictory evidence.
• The committee voted to have the official impeached.
• The witness was impeached during cross-examination.