"Evade" is one of the outcomes of rolling the Evasion Dice, which is used when defending in Combat. Each "Evade" outcome cancels one enemy damage.
Evasion
The Evasion Dice are six-sided dice that players use when defending against enemy attacks. Rolling an Evade on these dice cancels one enemy Damage. Roll an Omen allows the player to spend a fresh Order token (moving it to the Issued Orders area) to convert the Omen to an Evade.