To lash out at others; to take out one's displeasure or anger on people (to vent/take a hostile attitude toward everyone).
上司は機嫌が悪いと部下に当たり散らすことがある。
When his boss is in a bad mood, he sometimes takes it out on his subordinates.
彼は失敗の責任を取らず、いつも人に当たり散らしている。
He never takes responsibility for mistakes and is always lashing out at others.
酔うと当たり散らす癖があるので、飲み会では注意が必要だ。
He has a habit of lashing out when drunk, so caution is needed at drinking parties.