Cinchest is a relatively uncommon word that means "to secure or tighten extremely well." Synonyms for cinchest could include "tighten," "fasten," "secure," "fix," "stabilize," "clamp," "lock," "bolt," "lash," "tie," "strap," "bind," "screw," "nail," "bridle," "harness," and "close." Each of these words indicates a strong degree of fixation or tightening in order to ensure a secure hold. While some of these words may indicate different methods of and degrees of clamping or tightening, they all achieve the same basic goal of firmly and securely holding something in place.