Meaning of keep one's hand in in English:

keep one's hand in

phrase

British
  • Maintain a level of skill or ability in something by practising or engaging in an activity.

    • ‘I also did a bit of book reviewing to keep my hand in’
    train, rehearse, prepare, exercise, drill, work out, warm up, go through one's paces, keep one's hand in, get into shape, do exercises, study