nail down (someone or something)
to make certain or sure of something
I am trying to nail down the exact time that the meeting will begin.
Awesome Mental Health Resources
National Suicide Prevention
With the primary aim of keeping you going even in the darkest of times, this suicide prevention hotline is available 24/7 to offer a compassionate ear no matter what youre dealing with. Pour your heart out to a skilled staffer without fear of being judged, and if youd like referrals to local mental health care services after your call, hotline representatives can set you up.