secure, stave off, forestall, ward, preclude, keep, bulwark, allow, protect, cover, avert, fend, safeguard, fence, obviate, prevent, rule out, guard, nip in the bud, shield, screen.
What evil they intend!
" Now, Heaven forfend,"
quoth he, " that Robin Hood has fallen into the clutches of a King's man!
And Heaven forfend
that another such ride falls my lot.