Hint
Not by coincidence, this word is also a tense of a verb meaning "to split".
What do all the words below have in common?
But wait, don't stop there; rummage in the discards for the final answer to this puzzle, a three-word phrase.
Hint
How well do you know the notions of the world?
If you read off the letters that have been replaced in the country names, you get A LOST COUNTRY.
*Conga could also come from changing a letter in Congo, but A LOST COUNORY doesn't quite look as good!
Solution
All these words are one letter off from a country:
Chile ⟶ chime
Samoa ⟶ samba
Spain ⟶ T-Pain
Togo ⟶ pogo
Cuba ⟶ tuba
Laos ⟶ lads
Peru ⟶ perk
Lebanon ⟶ LeBaron
Tonga ⟶ conga*
France ⟶ fiance
Germany ⟶ germane
Congratulations to yesterday's solvers Connor (with help from Ishan and Yildiz), Graham, and, yes, the Greggs. Thanks to everybody who made a guess!
Ten years later, Dr. Shapiro revived Puzzle of the Day at Proof School, writing each day's puzzle on a name tag. After 600 puzzles or so, he was just starting to feel normal about students reading his chest all the time when campus closed and the puzzle, like the rest of our lives, moved online. New puzzles are posted daily on school days.
Want to catch up on old PotDs? There's an archive currently containing puzzles from March 2020 to March 2021.