Definition of downlevel in English:

downlevel

Syllabification: down·lev·el
Pronunciation: /ˈdounˌlevəl
 
/

adjective

Using an earlier version of software, hardware, or an operating system: there are still 600 million computers, many of them downlevel, that wouldn’t have all of these vulnerabilities fixed
More example sentences
  • And even if it could, ‘there's still 600 million computers, many of them downlevel, many of them on funny versions that wouldn't have all of these vulnerabilities patched, fixed and up to date’.
  • Next, I check to see if the client target of the page is downlevel.

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verb
eat or drink (something) greedily