(~s, precluding, ~d)
1.
If something ~s an event or action, it prevents the event or action from happening. (FORMAL)
At 84, John feels his age ~s too much travel...
VERB: V n/-ing
2.
If something ~s you from doing something or going somewhere, it prevents you from doing it or going there. (FORMAL)
A constitutional amendment ~s any president from serving more than two terms...
VERB: V n from -ing/n