Wordnet 3.0
NOUN (1)
1.
a standard for judging when freedom of speech can be abridged;
- Example: "no one has a right to shout `fire' in a crowded theater when there is no fire because such an action would pose a clear and present danger to public safety"
WordNet (r) 3.0 (2006):
clear and present danger
n 1: a standard for judging when freedom of speech can be
abridged; "no one has a right to shout `fire' in a crowded
theater when there is no fire because such an action would
pose a clear and present danger to public safety"