To launch an unbridled and extensive attack; to wantonly vilify or criticize fiercely.
那个竞争对手为了抹黑我们的产品，在社交媒体上大肆攻击
That competitor wantonly attacked our product on social media in order to discredit it.
Next Idiom
To launch an unbridled and extensive attack; to wantonly vilify or criticize fiercely.