English

lock screen

From lock + screen.

A compound of lock + screen

Proto-Indo-European *lewg- ‘to bend’

Proto-Germanic *luką

Proto-West Germanic *lok ‘shutter’

Old English loc

Middle English lok

English lock

Proto-Indo-European *(s)ker- ‘to cut off, sever’

…

Old Dutch skirm

Middle Dutch scherm

Anglo-Norman escren ‘firescreen’

Middle English scren

Today it means

noun A screen displayed by a computer or mobile device left unattended, requiring the user to perform a certain action to regain access.

Language periods are conventional ranges, not dates for this word.

Etymograph / lock screen