■ verb
1》 call into question the integrity or validity of (a practice).
2》 Brit. charge with treason or another crime against the state.
↘ chiefly US charge (the holder of a public office) with misconduct.
Derivatives
~able adjective
~ment noun
Origin
ME: from OFr. empecher 'impede', from late L. impedicare 'entangle' (based on L. pes , ped- 'foot').