Definition of log in/on phrasal verb from the Oxford Advanced American Dictionary

 

log in/on

 phrasal verb
phrasal verb
 
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Phrasal Verbs

log in/on

(computing)
 
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to perform the actions that allow you to begin using a computer system You need a password to log on.

log somebody in/on

(computing)
 
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to allow someone to begin using a computer system The system is unable to log you on.