spin
»You have been ploughed then?»
»Oh, come, you mustn’t despair. You’ve only been »spun», as you fellows call it, for a few months.» (The Prude’s Progr. 52. 15. 35.)
To be spun: to be rejected in an examination = to be plucked and to be ploughed.
Baumann and Farmer-Henley call it military slang (Royal Military Academy), but here it occurs during a conversation between two medical students and their civil friends.