umount
From NetBSD Wiki
umount - unmount mounted filesystems.
The umount(8) command calls the unmount(2) system call to remove a special device or the remote node (rhost:path) from the filesystem tree at the point node. If either special or node are not provided, the appropriate information is taken from the fstab(5) file.
mount /dev/wd0e /usr/pkgsrc umount /usr/pkgsrc
