Flammable or Inflammable? And Other Word Pairs That Share a Root

[Igel]

1. We have a few self-opposing words.

"Ravel" can mean to braid together or "unravel."

"Dusting your house" is rather the opposite of "dusting your crops"--a self-contained pun that the Adams Family tv show made use of a time or three. There are a few more verbs like that.

I rather like "moot", as well.

Subject to debate; arguable or unsettled.
Of no practical importance; irrelevant.

Not presenting an open legal question, as a result of the occurrence of some event definitively resolving the issue,

or the absence of a genuine case or controversy

And the US/British divide on "to table" in a meeting amuses:'

Chiefly U.S. to lay aside (a proposal, resolution, etc.) for future discussion, usually with a view to postponing or shelving the matter indefinitely.

British. to present (a proposal, resolution, etc.) for discussion.

So in Britain, if you table something it's on the agenda, in the US if you table something it's off the agenda.

And how "all in" has changed in my lifetime: now it's "showing a lot of determination" and/or commitment; but when I was a kid it was chiefly used to mean "completely exhausted". Now that's considered chiefly British and a bit old fashioned.