1.[uncountableU]TBEND the state of being concave 凹陷
2.[countableC]TBEND a place or shape that is curved inwards 凹陷处;凹面;凹处
Examples from the Corpus
concavity• With one fierce and skilful kick of his aching foot he will mend a deep concavity in the refrigerator's flank.• Also they are arrows, pointing outwards and confirming the concavity of each side.