Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Probably from a Scandinavian language

log

1 noun
     
Related topics: Daily Life, Plants, Maths
log1 S3 [countable]
1DHBP a thick piece of wood from a tree:
a roaring log fire
2 an official record of events, especially on a journey in a ship or plane:
The captain always keeps a log.
3HM a logarithm

➔ it's as easy as falling off a log

at fall1 (30)

➔ sleep like a log/top

at sleep1 (1)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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