καλχαίνω

A. make purple:—Pass., to be purple, Nic. Th. 641.

II. metaph. (cf. πορφύρω), make dark and troublous like a stormy sea, ponder deeply, κ. ἔπος S. Ant. 20; ἀμφὶ τέκνοις E. Heracl. 40: c. inf., long, desire, Lyc. 1457; cf. sq.