bite the biscuit
1. To die, break down, or become defunct. We all have to bite the biscuit someday. I drove that truck everywhere for 25 years, but it finally bit the biscuit yesterday.
2. To face up to, undertake, or confront some unpleasant or risky situation, action, or responsibility. You were the only person here when the television broke, so you might as well bite the biscuit and tell me the truth. I guess we'd better bite the biscuit and get this over with.
have had the biscuit
To be no longer functional or useful; to be dead or about to perish. Primarily heard in Canada. This old truck has served me well, but after lasting 20 years, it's finally had the biscuit. Despite the doctor's best efforts, it looked as though I'd had the biscuit.
take the biscuit
To be the most disappointing, annoying, shocking, outrageous, or egregious thing to have happened or been done. (Usually said hyperbolically.) But when I found out that he had been reading through my text messages, well, that took the biscuit! The government is using the taxes from the working class to bail out the banks that ruined the economy? That really takes the biscuit!
take the cake
Be the most outstanding in some respect, either the best or the worst. For example, That advertising slogan really took the cake, or What a mess they made of the concert-that takes the cake! This expression alludes to a contest called a cakewalk, in which a cake is the prize. Its figurative use, for something either excellent or outrageously bad, dates from the 1880s.