picket (
http://definr.com/picket)
n 1: a person employed to watch for something to happen [syn:
lookout,
lookout man,
sentinel,
sentry,
watch,
spotter,
scout]
2: a detachment of troops guarding an army from surprise attack
3: a protester posted by a labor organization outside a place
of work
4: a vehicle performing sentinel duty
5: a wooden strip forming part of a fence [syn:
pale]
v 1: serve as pickets or post pickets; "picket a business to
protest the lay-offs"
2: fasten with a picket; "picket the goat