Scylla Definition

Scylla
noun

1. Greek mythol.
A six-headed sea monster situated on a dangerous rock on the Italian side of the Straits of Messina, opposite Charybdis a whirlpool.

Idiom: between Scylla and Charybdis

Faced with danger on both sides, so that avoidance of one means exposure to the other.

Etymology: 16c: from Greek Skylla.