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A combination "firm up" and "nail down"; often used to express a soft commitment to something or a lack of clarity around something that will eventually be fully committed to or fully clarified.
I'm like 60/40 to attend the Trials in Eugene, but I'll let you know when I'm firmed down.

Soon we'll need to firm down a date for when the new release is going to go out.
by UltimateCranston May 29, 2016
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