Definition of picketed:
(n) :
A protester positioned outside an office, workplace etc. during a strike (usually in plural); also the protest itself.
(v) :
(intransitive) To protest, organized by a labour union, typically in front of the location of employment.
(n) :
(military) One of the soldiers or troops placed on a line forward of a position to warn against an enemy advance; or any unit (for example, an aircraft or ship) performing a similar function.
(n) :
(sometimes figurative) A sentry.
(n) :
A stake driven into the ground.
(n) :
A tool in mountaineering that is driven into the snow and used as an anchor or to arrest falls.