On top of the brief campaign, you can play either competitively or cooperatively with another player. (videochums.com)
Corbyn's problem was that he wasn't on top of his brief, so he let Cameron get away with a highly misleading series of statements on weekend NHS care. (politics.co.uk)
Ms Abbott told ITV News that she «misspoke» in the interview and insisted she is «completely on top of her brief», emphasising the fact it was the «sixth interview out of seven». (itv.com)