pin down
中上級 (B2) neutral
to make something exact and clear
"It's hard to pin down the exact reason he left."
文脈の中で聞く
When a Tiny Land Bridge Triggered an Ice Age
PBS Eons · 9:26
difficult to pin down the exact
What was Euclid really doing? | Guest video by Ben Syversen
3Blue1Brown · 25:18
axiomatic deductive proofs to pin down
The 2025 Christmas Q&A (feat. Mary Willems)
Patrick Willems Presents · 25:49
it's hard to pin down.
I told him that I love him.
Nathaniel Drew · 4:17
reason that's harder to pin down.
Reverse Mathematics - Numberphile
Numberphile2 · 5:12
okay just trying to pin down exactly