手上那個喇叭
最原本的一家：真的可以拿在手上的器具。
noun · B1
A wide, cone-shaped tool that you hold up and speak into, so that your voice carries much further and reaches a crowd.
大聲公
核心畫面
Hold the object first: a cone, wide at one end, that you speak into so your voice goes one way and goes far. A small sound leaves it as a large one, and everyone in front of it hears the same words at the same time. Every other use keeps that shape. A magazine that carries a small group's message is the cone. A government that makes its demands in public instead of in a meeting room is talking through the cone at another country. The word never means that the message is better — only that it has been made louder and pointed somewhere.
先握住那個東西：一個錐形筒，一頭大、一頭小，對著小的那頭講話。聲音會往一個方向送，而且送得很遠。小小的聲音出去時變大…更多收起
先握住那個東西：一個錐形筒，一頭大、一頭小，對著小的那頭講話。聲音會往一個方向送，而且送得很遠。小小的聲音出去時變大了。站在前面的人同時聽到同樣的話。後面的用法都保留這個形狀。一本替小團體傳話的雜誌，就是那個筒子。一個政府不進會議室、改在公開場合喊話，等於拿著筒子對另一個國家講話。這個字從來不表示那些話比較有道理，只表示它被放大了，而且被指向某個方向。From the word’s history
The source gives the word as mega- (big) plus -phone (sound), which lines up exactly with what the object does.
來源資料說這個字是 mega-（大）加 -phone（聲音）。這正好對上那個器具在做的事：把聲音變大。
Wiktionary entry for megaphone (etymology 1), etymology_text supplied in this packet: "From mega- + -phone." (source_ref kaikki:3f6f69a190036ae4:1180096939)
Two branches
把別人的話放大
喇叭的形狀被搬去形容人、媒體和說話的方式：一樣是把聲音放大、指向某處。
noun · C1
A person, group or channel that carries someone else's message out to a lot of people, so it reaches much further than it could alone.
傳聲筒；放大器