a person or group of people posted by a trade union at a place of work affected by a strike to try to persuade workers not to go in or to prevent them doing so

a person or group of people posted for a demonstration or protest

a small body of troops detached to guard an army from surprise attack

a detachment kept ready in camp for such duty

a pointed or sharpened stake or post

(used before a noun) consisting of pickets

a picket fence

to post pickets at (a place of work, etc)

to walk or stand in front of (a place of work, etc) as a picket

to guard (an army) with a picket

to post (a detachment of troops) as a picket