To recant solemnly; renounce or repudiate: "For nearly 21 years after his resignation as Prime Minister in 1963, he abjured all titles"

Severe or stern in disposition or appearance; Strict or severe in discipline: "The austere figure of a Puritan minister.

To punish or rebuke severely. " If you don't castigate him when he actually makes the mistake, he will get away with it every time and never improve himself."