I was researching the etymology of disdain which rechannels to the following:
[ Etymonline for 'deign (v.)' ] c. 1300, from Old French deignier (Modern French daigner), from Latin dignari "to deem worthy or fit" ..., from dignus "worthy" (see dignity).
Sense of "take or accept graciously" led to that of "condescend" (1580s).
My problem lies with the bolded, because it merely states a surprising inversion of meaning, but it and the OED don't explain why.
Please help me dig deeper than the given etymologies, which I already understand and so ask NOT about. I recognise the Etymological Fallacy. But what are some right ways of interpreting the above, to make it feel reasonable and intuitive?