Definition of line something out in US English:

line something out

phrasal verb

  • Transplant seedlings from beds into nursery lines, where they are grown before being moved to their permanent position.

    • ‘Once transferred to individual pots, they can be put back in the cold frame or kept in the greenhouse until danger of frost is past when you can line them out in a protected place.’
    • ‘He starts with rooted cuttings and lines them out in the field about 30' apart.’