to bow deeply and prostrate oneself; to show extreme humility or contrition (often by bowing deeply).
問題が発覚した後、社長は平身低頭して関係者に謝罪した。
After the problem came to light, the president bowed deeply and apologized to those involved.
彼はミスの責任を取るために平身低頭した。
He humbly submitted himself to take responsibility for the mistake.
訪問先で平身低頭の礼を尽くした。
At the place visited, he showed utmost humility in his greetings.