The Spanish verb 'sesgar' (meaning 'to bias' or 'to slant') has an interesting evolution from Latin roots. It begins with the Latin verb 'sedere' meaning 'to sit'. This developed into its past participle form 'sessus' meaning 'seated'. In Vulgar Latin, this evolved into 'sessicare' meaning 'to calm' or 'to settle' - likely drawing from the notion that sitting down has a calming effect. This then became 'sessegar' in Old Spanish, still maintaining the meaning of 'to calm'. Finally, it evolved into modern Spanish 'sesgar', where the meaning shifted metaphorically from 'settling' or 'calming' to the idea of 'slanting' or 'biasing' - perhaps from the notion of settling or leaning to one side.

Several common Spanish words share this Latin root 'sedere' (to sit): 'sentar' (to sit), 'asentar' (to settle), 'sedentario' (sedentary), and 'sede' (seat, headquarters). While 'sesgar' developed to mean 'to slant or bias', these related words maintained meanings more closely connected to the original concept of sitting or settling.

English speakers might recognize this Latin root in words like 'sedentary' (involving much sitting), 'sediment' (material that settles to the bottom), 'sedate' (calm, quiet), and 'session' (a period of time spent on an activity). All these words trace back to Latin 'sedere' (to sit), just like Spanish 'sesgar', though they developed different meanings over time.