Lay down is a common phrasal verb that means to place something in a horizontal position, most often in preparation for rest or sleep. However, there are many other terms that can be used in place of lay down to describe this action. Some examples include: recline, lie down, stretch out, rest, repose, recline, recumb, sprawl, and flat out. Each of these words captures a slightly different nuance or connotation, such as emphasizing relaxation or ease, or suggesting a more formal or structured position. By using these synonyms, writers and speakers can add variety and specificity to their language, and better convey the mood or tone they wish to express.