borstal training en · NOUN
Meanings
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(UK, historical, uncountable) The sentencing of young offenders to a special prison.
The court could sentence them to 'Borstal training', which meant that they were detained in a Borstal institution for an indeterminate period of between six months and two years.
1989, Richard Meredith Jackson, J. R. Spencer, Jackson's Machinery of Justice, page 277: