starch (v.) Look up starch at Dictionary.com
c.1400, from Old English *stercan (Mercian), *stiercan (West Saxon) "make rigid," found in stercedferhð "fixed, hard, resolute" (related to stearc "stiff"), from Proto-Germanic *starkijanan (cf. German Stärke "strength, starch"), from PIE root *ster- "strong, firm, stiff, rigid" (see stark). Related: Starched; starching.
starch (n.) Look up starch at Dictionary.com
"pasty substance used to stiffen cloth," mid-15c., from starch (v.). Figurative sense of "stiffness of manner" is recorded from 1705.