My understanding is that "off the line" means "not on the line". For example an internet user is offline, meaning "not connected". However "Off-line power supplies" are directly connected to the grid (without line frequency transformer). Who coined this strange term?
Electronic – Why off-line power supplies are called so, like they are “off the line”
power supply
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Best Answer
For me, who are not native English speakers, the terminology is a bit mysterious. However here I found this definition: