Daily Chinese Idiom Wordle Game
掉以轻心 (diào yǐ qīng xīn)
To treat something carelessly or to not take something seriously.
Literal: drop take light heart
He handled the safety inspection with a casual attitude, but this is not something to take lightly.
This idiom warns against being too casual about important matters.
The third character suggests a lack of weight or seriousness.