Longman Dictionary of Contemporary English
day release
noun
EXAMPLES FROM CORPUS
▪ A bog-eyed incubus on day release from hell?
▪ As very few allow them to pursue day release courses, the main provision is on an evening basis.
▪ However although many employers grant day release facilities, most of your preparation for the examinations will take place outside office hours.
▪ I've got four CSEs and I spent a year on day release, learning about making wreaths and business management.
▪ Of the former, 10.1 percent were on full-time courses and 11.4 on part-time day release.
▪ She now attends a day release course in Glasgow studying for stage two of the Chartered Accountants Examination.
▪ So I then applied for a couple of jobs, and I was offered day release to do my A levels.
▪ Unions eagerly encourage the further involvement of such women by means of day release or other union courses.
Wiktionary
day release
n. 1 (anchor: Noun-prison)Temporary liberation from a prison, for the period of one day. 2 (anchor: Noun-employment)Paid leave of absence from employment (one day per week) to attend college