2 verb
log2 past tense and past participle logged, present participle logging
1 [transitive] to make an official record of events, facts etc:
All phone calls are logged.
2 [transitive]TTA to travel a particular distance or for a particular length of time, especially in a plane or ship:
The pilot has logged 1200 flying hours.
3 [intransitive and transitive]TAF to cut down trees

log in/on

phrasal verb
TDTD to do the necessary actions on a computer system that will allow you to begin using it
log in/on to
You need to log on to your home page.

log off/out

phrasal verb
TDTD to stop using a computer system by giving it particular instructions

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