anticipate
avert
bar
debar
deflect
deter
discourage
dishearten
estop
exclude
fend
fend off
forbid
foreclose
forestall
help
interfere
interpose
intervene
keep from
keep off
overcome
preclude
prevent
prohibit
repel
rule out
save
stave off
turn aside
ward
ward off
close out
obviated
obviates
obviating