Chengyu usage loop
画蛇添足
to ruin something by adding unnecessary extra work. Learn the modern situation first; the old story is useful only after the idiom has a job.
to overdo it; to gild the lily
Situation first
to overdo it; to gild the lilyA chengyu is a compressed judgment about a situation. Random idiom sprinkling is how learners sound like a proverb calendar.
Reading supports
Use these after the first listen. Pinyin is scaffolding; English is context; neither should become a sofa.
Literal meaning
draw a snake and add feet
Story
In the old story, someone finished drawing a snake first, then added feet to show off. Because snakes do not have feet, the extra detail made the drawing wrong.
Modern usage
Use it when someone overdoes a solution, adds unnecessary features, or complicates a clean plan.