all sizzle and no steak
📖 generalMeaning
All show and no substance; impressive in appearance but lacking in real value or quality.
Literal Meaning
A comparison between the visible, exciting 'sizzle' (the aroma/sound of cooking) and the actual, solid 'steak' (the core item).
Example
“His promises were all sizzle and no steak; he never followed through on his commitments.”