The phrase "get down to" is a commonly used expression to describe one's approach towards achieving tasks. It means to start focusing on something and putting aside distractions. There are several synonyms for this phrase that can be used interchangeably depending on the context of the sentence. Some examples include: buckle down, knuckle down, dive in, set to work, concentrate on, and begin working. All these phrases denote taking a serious and committed approach to achieve the desired outcome. Utilizing synonyms for "get down to" can help add variety to your writing or speaking, making it more interesting and engaging.