擺在旁邊的板子
這一支就是核心畫面的實體版本：真的有一片板子或檯面立在旁邊。
noun · B2
A long, low piece of furniture with drawers and cupboards, usually standing against the wall of a dining room, where plates, glasses and table cloths are kept and where food can be put out.
餐邊櫃
核心畫面
One way to hold sideboard is to take the two halves at face value: a board standing along the side of something, off to one side of the main action. The table is where dinner happens; the board along the wall waits beside it. The truck bed is where the load sits; the boards along its edges hold it in. Each meaning is something useful placed at the edge rather than in the middle.
sideboard 可以想成就是字面上的兩塊拼起來：一片立在旁邊的板子，待在主角的邊上。吃飯的主場是餐桌，靠牆的那個…更多收起
sideboard 可以想成就是字面上的兩塊拼起來：一片立在旁邊的板子，待在主角的邊上。吃飯的主場是餐桌，靠牆的那個檯面就在旁邊候著；載貨的主場是車斗，兩側的板子就沿著邊擋著。這個字的每個意思，都是把一樣有用的東西放在邊邊，而不是放在正中間。From the word’s history
Wiktionary gives the etymology as simply side + board, for both the noun and the verb.
Wiktionary 對名詞和動詞都只記了一句：From side + board——就是 side（旁邊）加 board（板子）。
Wiktionary entries for sideboard (noun and verb), etymology_text: From side + board (kaikki:3f6f69a190036ae4:904239457 / :904252634)
Three branches
放在旁邊備用的一組
這裡的「旁邊」不再是一片板子，而是位置：主力旁邊那一份候補。
noun · C1
In collectible card games, a small set of extra cards kept beside your main deck, which you are allowed to swap in between games so that your deck suits the opponent you are facing.
備牌
臉側邊的那兩撮
同樣是「側邊的一條」，只是這次長在臉上。要提醒的是：這條連結是幫助記憶的畫面，資料裡並沒有說明這個意思是怎麼來的。
noun · C1
Sideboards are the strips of hair that grow down the sides of a man's face in front of his ears. This is a British English word, and it is always plural; the word used in most other places is sideburns.
鬢角