Definition of lock someone down in English:

lock someone down

phrasal verb

North American
  • Confine a prisoner to their cell.

    ‘the men were locked down for the usual curfew bedtime’
    • ‘I was locked down in a cell made for two, with five people, no working toilet, no food and no protection.’
    • ‘Before I was locked down, 3 troublemakers entered my cell and commenced to verbally assail my ailing celly.’
    • ‘Even his incarceration could not stop him working towards his ambition of a Lonsdale Belt: ‘I managed to train every day, even though I was locked down from eight at night until eight in the morning.’’