A sentry.
A type of punishment by which an offender had to rest his or her entire body weight on the top of a small stake.
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.
A protester positioned outside an office, workplace etc. during a strike (usually in plural); also the protest itself.
The card game piquet.
A stake driven into the ground.
A tool in mountaineering that is driven into the snow and used as an anchor or to arrest falls.
To enclose or fortify with pickets or pointed stakes.
To tether to, or as if to, a picket.
To guard, as a camp or road, by an outlying picket.
To protest, organized by a labour union, typically in front of the location of employment.
A sentry, watch, or guard.
A unique string of characters recognised by a computer program for processing in a special way; a keyword.
A sentinel crab.
A sign of a health risk (e.g. a disease, an adverse effect).
To post as guard.
To post a guard for.
To watch over as a guard.