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1. To access a digital account or network, typically by entering personal credentials; to log in. I'm having trouble logging on to my computer, so I haven't had a chance to check my email yet.
2. To allow someone to digital account or network; to log someone in. In this usage, a noun or pronoun can be used between "log" and "on." I've having trouble accessing my account from home—any chance IT can log me on remotely?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
log someone on (to something)
to allow someone to link (electronically) to a computer system. (This action may be recorded, or logged, automatically in the computer's memory.) I will log you on to the system if you forgot how to do it. I will log on Jill, who is late.
to begin to use a computer system, as by entering a password, etc. (This action may be recorded, or logged, automatically in the computer's memory.) What time did you log on to the system this morning? I always log on before I get my first cup of coffee.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To provide the necessary information to a computer for someone to be allowed to access computer resources: Let me log you on so that you can access the files yourself. You can't use this program until you log on.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.