puzzle over

To keep thinking about something because you can't understand it or find the answer.

"Scientists have puzzled over this strange phenomenon for decades."

Hear it in context

The First, Second, and Third Crusades: 1095-1192 | MEGA-COMPILATION DOCUMENTARY

Real Crusades History · 225:17

dying historians today still puzzle over the mystery

After YEARS of Work… Turbo R32 Finally Looks Like a Car Again

HumbleMechanic · 21:29

We have one other piece of the puzzle over here

Roman Yampolskiy Testifying for UK Parliament/Human Rights Committee.

Roman Yampolskiy · 34:04

So we will puzzle over what you have to say.

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