placard

名词 placard:

1. a sign posted in a public place as an advertisement
   同义词：poster, posting, notice, bill, card

动词 placard:

1. post in a public place
2. publicize or announce by placards
   同义词：bill

1. A large, usually printed placard, bill, or announcement, often illustrated, that is posted to advertise or publicize something.
   海报通常印刷而成的大布告、招贴或公告，常附有插图，张贴以用来宣传或公布某事
2. The placards condemned the government's action.
   那些标语牌上写著谴责政府措施的词句。

plac.ard

n.（名词）
A sign or notice for display in a public place.
布告标语牌：为在公共场合展示的通知或标语
A small card or plaque, such as a nameplate on a door.
小牌：一种小卡片或牌，如门上的姓名牌
v.tr.（及物动词）
plac.ard.ed,plac.ard.ing,plac.ards
To announce or advertise by means of placards.
（用海报）做广告：用布告、海报宣布或做广告
To post placards on or in.
张贴：将告示贴出
To display as a placard.
用布告公布

来源：
Middle English [official document]
中古英语 [官方文件]
from Old French
源自 古法语
from plaquier [to plaster, piece together]
源自 plaquier [粘在一起]
from Middle Dutch placken [to patch]
源自 中古荷兰语 placken [拼凑]

【引伸】
plac.ard.er
n.（名词）