Buy the farm refers to someone passing away or dying. It is a colloquial term that has been around since the early 20th century. There are several other synonyms for buying the farm that one might come across. Some of the popular ones include kicking the bucket, biting the dust, cashing in one's chips, and pushing up daisies. All of these euphemisms are used to describe someone's death in an informal manner. It is always advisable to be sensitive while using such phrases as they might hurt someone's feelings. Hence, it is better to use simpler and less severe phrases when talking about someone's demise.