At Trinity College Dublin and the University of Cambridge, a sizar /ˈsaɪzər/ is an undergraduate who receives some form of assistance such as meals, lower fees or lodging during his or her period of study, in some cases in return for doing a defined job.
According to William Howitt, writing in 1847 with reference to Oliver Goldsmith: Trinity College Dublin, is a noble structure; and, with its spacious courts and extensive gardens, more fittingly deserving the name of parks, one would think a place where the years of studentship might — especially in the heart of such a city — be very agreeably spent.
It was at that period far worse; they wore red caps to distinguish them, and were compelled to perform derogatory offices; to sweep the courts in the morning, carry up the dishes from the kitchen to the fellows' table, and wait in the hall till they had dined.
He has recorded his own feelings and opinions on this custom: "Sure pride itself has dictated to the fellows of our colleges the absurd fashion of being attended at meals, and on other public occasions, by those poor men who, willing to be scholars, come in upon some charitable foundation.
A spirited fellow at length caused the abolition of the practice of the sizers acting as waiters, and that, too, on grand occasions before the public, by flinging the dish he was carrying on Trinity Sunday, at the head of a citizen in the crowd, assembled to witness the scene, who made some jeering remarks on the office he had to perform.