I have heard on three podcasts this week, all by USofAmerican podcasters, the use of the word calvary. To a UK-English speaker (like me) this means the place where Jesus was crucified.
However in each case the podcaster was referring to horse-mounted soldiers, which in my book is cavalry.
I have looked at Merriam-Webster and can find nothing to support this usage. Is this just collective crapness?