Posted on August 16, 2019March 26, 2023 by Idioms Poster It sank like a log That so-called modern boat sank like a log. Ed, London. (Present tense) Sink like a log! (not a rock or a stone) A mix up of these idioms Sink like a stone, and Sleep like a log. Source of this Mixed Idiom Sent in by Ed, London. Related IdiomsReal idiom: Sleep like a logReal idiom: Sink like a rockReal idiom: Sink like a stone Post navigationPrevious post: I’m treading on tortoise shellsNext post: Rough end of the stick