a crossing of two passages, as airways, dug at the same level so that one descends to pass beneath the other without any opening into it. Cf.(def. 9). · an overcast layer of clouds viewed from above. Found on https://www.infoplease.com/dictionary/undercast
• (v. t.) To cast under or beneath.
a crossing of two passages, as airways, dug at the same level so that one descends to pass beneath the other without any opening into it. Cf.(def. 9). · an overcast layer of clouds viewed from above.