The kids are to be stopped wearing round tops like their betters, so you'd best cut yours square.

Brown was too 'cute to try for an exhibition.
It's bad enough for him to be a day boy, but it would be a jolly sight worse to be an exhibitioner as well.

When you come up, mind you're not to collar me.

It's bad form for a kid to collar a senior.

Wait till I speak to you, or else get some chap to bring you and introduce you.
Fellows who shirk form get jolly well lammed; so you'd better go easy at first.