The word "un-loosening" refers to the act of tightening something or making it less loose. Synonyms for this word include tightening, securing, fastening, fixing, binding, tethering, anchoring, clamping, cinching, and snugging. These synonyms can be used to describe a variety of situations, from tightening a bolt or screw to securing a valuable item. In some cases, these synonyms may have slightly different connotations or implications, such as cinching being used to describe tightening a belt or strap. However, all of these words share the common meaning of making something more secure or less loose.