Billet at is a phrase that implies a person is temporarily housed or lodged at a specific location. There are several synonyms that can be used interchangeably with billet at, including quarter, house, accommodate, lodge, board, shelter, and reside. Each of these synonyms has its own unique connotation, making them useful in different contexts. For instance, accommodate might be more appropriate in a formal setting, while lodge might be more suitable in a rustic setting. Regardless of which synonym is used, the meaning of billet at remains the same, and it is a useful phrase when describing a temporary housing arrangement.