名詞 picket:

1. a person employed to watch for something to happen
   同義詞：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
   同義詞：pale
6. a form of military punishment used by the British in the late 17th century in which a soldier was forced to stand on one foot on a pointed stake
   同義詞：piquet

動詞 picket:

1. serve as pickets or post pickets
2. fasten with a picket

1. Five pickets were injured in the scuffle.
   在混戰(zhàn)中有五名罷工糾察隊員受傷。
2. Some of the union members did not want to picket.
   工會的一些會員不想擔任罷工糾察員。

pick.et

n.（名詞）
A pointed stake often driven into the ground to support a fence, secure a tent, tether animals, mark points in surveying, or, when pointed at the top, serve as a defense.
尖木樁：通常插入地面的尖木樁，用來支撐籬笆、固定帳篷、拴動物，在勘探時作標記，當尖頭在頂端時則用作防御工具
A detachment of one or more troops, ships, or aircraft held in readiness or advanced to warn of an enemy`s approach:
前哨，警戒哨：一支或多支部隊、艇隊或飛機的分遣隊，準備或提前來提醒敵人的接近：
例句：
.The outlying sonar picket. . . . was to detect, localize, and engage any submarine trying to close the convoy.(Tom Clancy)
.外部聲納警戒隊的任務是…發(fā)現(xiàn)、定位和掌握任何企圖靠近護衛(wèi)艦的潛水艇.(湯姆·克蘭西)

A person or group of persons stationed outside a place of employment, usually during a strike, to express grievance or protest and discourage entry by nonstriking employees or customers.
工會糾察員：通常在罷工期間，駐扎在工作單位外面的人或一群人，以表示不滿或反抗，阻止非罷工雇員或顧客進入
A person or group of persons present outside a building to protest.
示威抗議者：駐扎在職業(yè)大樓之外進行示威的人或一群人
v.（動詞）
pick.et.ed,pick.et.ing,pick.ets
v.tr.（及物動詞）
To enclose, secure, tether, mark out, or fortify with pickets.
用尖樁圍?。河媚緲秶?、固定、拴住、標出或固定住

To post as a picket.
派…擔任前哨
To guard with a picket.
以哨兵防衛(wèi)
To post a picket or pickets during a strike or demonstration.
派出糾察員：在罷工或示威期間設置一個或幾個糾察隊
v.intr.（不及物動詞）
To act or serve as a picket.
擔任糾察員

來源：
French piquet
法語 piquet
from Old French
源自 古法語
from piquer [to prick] * see pique
源自 piquer [刺，扎] *參見 pique

【引伸】
pick.eter
n.（名詞）