To Picket

1. (intransitive) To protest, organized by a labour union, typically in front of the location of employment.
2. (transitive) To enclose or fortify with pickets or pointed stakes.
3. (transitive) To tether to, or as if to, a picket.
4. (transitive) To guard, as a camp or road, by an outlying picket.
5. (obsolete, transitive) To torture by forcing to stand with one foot on a pointed stake.