touch down
To land; to make contact with the ground. We couldn't touch down due to ice on the runway. The storm is expected to touch down sometime around 2 AM.
touch down
[for an airplane] to come in contact with the ground; to land. Flight twelve is due to touch down at midnight. When will this plane touch down?
touch down
Land on the ground, as in The spacecraft touched down on schedule. This idiom was first recorded in 1935.
touch down
v. To make contact with the ground; land: The tornado touched down in a remote area.