Slaughtering
Hebrew: שוחט
Definition: Ending the life of a creature, whether through slaughter or any other method.
See further: Mishneh Torah Shabbos 11:1–4; Shulkhan Arukh Orach Chayim 316; Chayei Adam Shabbos 31
Read more about this topic: Activities Prohibited On Shabbat, The Thirty-nine Creative Activities