Archaic third-person singular present tense of 'cast'; used in older English (especially the King James Bible) meaning 'throws' or 'directs'.
From Old English 'castan' (to throw) with the archaic '-eth' suffix forming third-person singular verbs. This grammatical form is characteristic of Early Modern English (1500-1700) before '-s' became the standard ending.
When you read 'he casteth his net upon the waters' in the King James Bible, the '-eth' ending sounds poetic today but was actually just normal grammar in 1611. Language change is visible in Bible translations spanning centuries!
Complete word intelligence in one call. Free tier — 50 lookups/day.