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Wiktionary
write out

vb. (context transitive English) To write in full length or expanded form.

WordNet
write out
  1. v. put into writing; write in complete form; "write out a contract" [syn: write up]

  2. make out and issue; "write out a check"; "cut a ticket"; "Please make the check out to me" [syn: issue, make out, cut]

Wikipedia
Write out

A write out is a punishment used in schools in which a misbehaving student must write something out. It is different from writing lines as, instead of writing something out a number of times, the student might write out a page, chapter or paragraph of their schoolbook, workbook or novel. In the case of non-written homework ( spellings), the student might have to write the spellings a number of times.