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
Bidelia-Irish
Leudbald-Ancient Germanic
AlfieAL-feeEnglish
Joye[dʒɔi]
Zdislav-Czech, Medieval Slavic
EdithEE-dith (English), E-dit (German, Swedish)English, German, Swedish, Norwegian, Danish, Dutch