Meaning: very slow to learn or understand. Use examples.
Rewrite 1: as dense5 as the heart of a black hole
Rewrite 2: the density8 of a block of ice
Rewrite 3: denser than marble
Rewrite 4: no smarter than a block of salt
Comment: We should be careful to ensure people understand we’re talking learning curve here, not geophysics.
More reading about clichés
What I found when I googled “clichés”:
• Baylor University The Lariat Online: “Defining ‘men’ requires thinking outside the cliché.”
Note: By providing links to other websites I am only showing you what is out there about clichés – I am not endorsing any content or opinion expressed there.
Check out the searchable alphabetical list of all my cliché rewrites available in the archive list at the right.