An onomatopoeic adverb meaning to do something energetically, vigorously, or mercilessly—without holding back; can suggest strictness or brisk efficiency.
新しいコーチはビシバシ指導するので、選手の技術が早く上がった。
The new coach trains mercilessly, so the players' skills improved quickly.
彼は仕事をビシバシ片づけるタイプだ。
He is the type who gets work done quickly and efficiently.
練習中、コーチにビシバシ注意されたが、それが自分の成長につながった。
During practice the coach scolded me harshly, but that led to my improvement.
荷物をビシバシ片付けて早く出発しよう。
Let's pack things up briskly and leave early.