The Collaborative International Dictionary
Concaving
Concave \Con"cave\, v. t. [imp. & p. p. concaved; p. pr. & vb. n. Concaving.] To make hollow or concave.
Wiktionary
concaving
vb. (present participle of concave English)
Usage examples of "concaving".
He sucked in, his cheeks concaving and his eyes staring while the air went sss through his pursed mouth.