There are a number of synonyms for the phrase "stakes down", depending on the context in which it is used. If you are talking about securing something in place, you might use words such as anchoring, tethering, or fastening. If you are discussing the process of lowering something, you could describe it as descending, dropping, or settling down. Using the phrase "stakes down" might also indicate a sense of finality - in that case, you might look for words that convey a similar sense of completion or resolution, such as concluding, finishing, or sealing. Whatever the purpose of your writing, there are plenty of words and phrases that can be used interchangeably with the phrase "stakes down".