χαίνω or χάσκω (root χα, cf. hisco),
aor. 2 opt. χάνοι, part. χανών, perf. part. κεχηνότα: gape, yawn; ‘may the
earth engulf me,’ Il. 4.182,
etc.; perf. part., ‘with open mouth,’ aor., πρὸς κῦμα χανών, ‘opening my
mouth’ to the wave, i. e. swallowing the water, Od. 12.350.