undercast

Etymology
From, equivalent to.

Noun

 * 1)  An unbroken or nearly unbroken cloud layer below the point of observation.
 * 2)  An air-passage crossing a road in a mine by means of an airtight box or channel beneath it.
 * 1)  An air-passage crossing a road in a mine by means of an airtight box or channel beneath it.
 * 1)  An air-passage crossing a road in a mine by means of an airtight box or channel beneath it.

Verb

 * 1) To allocate the parts in (a play or film) to insufficiently skilled actors.
 * 2) To throw under or beneath.