Artificial intelligent assistant

otter-down

otter-down
  erroneous for eider-down (an unfamiliar word at the time).

1759 Johnson Idler No. 40 ¶4 Now to be sold, for ready money only, some duvets for bed-coverings, of down, beyond comparison superior to what is called otter-down.

Oxford English Dictionary

yu7NTAkq2jTfdvEzudIdQgChiKuccveC 18ca0c0eb42de439f900e0b1f7e01fa2