Short answers, pulled from the story.
Lexico was a dictionary website that hosted free English and Spanish dictionaries produced by Oxford University Press. The site was operated by Dictionary.com, not by OUP, as part of a collaboration between the two organisations launched in June 2019.
Lexico closed on the 26th of August 2022. From that date, the domain was redirected to Dictionary.com.
Lexico offered the Oxford Dictionary of English and New Oxford American Dictionary for free, focusing on current English with common modern meanings listed first. The Oxford English Dictionary is a subscription service and a historical record covering more than a thousand years of English, including obsolete terms, with meanings ordered by when they were first recorded.
The name Lexico came from Lexico Publishing Group, LLC, the former corporate name of Dictionary.com's parent company. The name was not created specifically for the Oxford partnership.
Oxford Global Languages, launched in 2014, ultimately hosted dictionaries for Zulu, Northern Sotho, Malay, Urdu, Tswana, Indonesian, Romanian, Latvian, Swahili, Hindi, Tamil, Gujarati, Tatar, Xhosa, Southern Quechua, Tajik, Tok Pisin, Turkmen, Telugu, and Greek before the programme's websites closed in March 2020.
OUP offered online dictionary access through AskOxford.com in the 2000s, then launched Oxford Dictionaries Online in 2010, which was later rebranded as Oxford Living Dictionaries for its free content in 2016. The free dictionaries moved to Lexico.com in June 2019. Throughout this period, the definitions were also available via the Oxford Dictionaries API, powering Google definition search and the macOS Dictionary application.