From Longman Dictionary of Contemporary Englishkick the bucketkick the bucketold-fashionedDIE to die – used humorously → kick
Examples from the Corpus
kick the bucket• If Primrose was in a black mood she would like as not kick the bucket over.• Jinny was so startled that she nearly kicked the bucket over.• When I kick the bucket you'll be able to live on my life insurance. 