can't nail (something) down



can't nail (something) down

Unable to complete, do correctly, or be certain of some task or thing. I've been working on my speech for an hour, but I can't seem to nail it down. They couldn't nail down the terms of their agreement. I know I've heard this song before, but I can't quite nail it down.
See also: down, nail

Common Names:

NameGenderPronouncedUsage
Urszulauwr-SHUW-lahPolish
Cecilija-Slovene, Croatian
Kostandin-Albanian
TitoTEE-to (Italian, Spanish)Italian, Spanish, Portuguese
Sakina-Arabic
Altansarnai-Mongolian