In the age of the #MeToo movement, the use of the term “mansplaining” — to point out patronizing explanations made by men to female counterparts — has become increasingly mainstream.

So mainstream that it’s now been used by Britain’s prime minister in the House of Commons.

Prime Minister Theresa May denounced comments by Jeremy Corbyn — the opposition leader who criticized her for meeting with Crown Prince Mohammed bin Salman of Saudi Arabia ahead of International Women’s Day — as “mansplaining” during a session on Wednesday.

“Can I thank the right honorable gentleman for telling me that it’s International Women’s Day tomorrow? I think that’s what’s called mansplaining,” Mrs. May said, shooting a cold stare at Mr. Corbyn, before defending her meeting with Prince Mohammed during his visit to Britain. She said she planned to raise human rights concerns during the meeting.