1. 百发百中,切中要害：95. button your lip 闭口不谈 | 96. on the button 百发百中,切中要害 | 97. buttonhole 拉住人不放,并且没完没了的长谈
2. 准确地,准时地：Can't but do sth.=can't help doing sth.不得不 | 93. On the button准确地,准时地 | 94. Buy sth.for sb.=buy sb.sth.给某人买某物
3. 正好：26.Now, you're talking. 這才像話. | 1.on the button :正好------------------------------------------ H 7 | 2.on the heels :緊追------------------------------------------- H 10
4. 击中下颌 确切; 抓着要点, 能说明问题; 准时：not worth a button 一钱不值 | on the button 击中下颌确切 抓着要点, 能说明问题 准时 | press the button 按钮拍快照开始采取有效行动
adj
1. being precise with regard to a prescribed or specified criterion
e.g. his guess was on the nose
the prediction for snow was right on the button
Synonym: on the nose