- 1卡扣式的、按上就固定的（用手一壓就「喀」一聲扣上，也能輕鬆拔下來，不用螺絲或工具）
Describing a part that you fix into place by pressing it until it clicks, and take off again just as easily — no screws, no glue, no tools. Snap-on wheels, a snap-on lid, a snap-on phone case, snap-on lens for a camera. The word tells you two things at once: how it goes on (a quick push and a click) and that it is meant to come off again, so you can swap it, clean it, or replace it. That is why it appears so often in and instruction manuals — it is a selling point that says easy. It goes before a noun and stays the same: a snap-on cover, two snap-on covers. As a verb the words separate: the lid snaps on. Related words follow the same idea: snap-together, clip-on, press-fit. The idea comes straight from snap, the sound of that small sharp click, which is also why we snap our fingers and why a bag has a snap . (Snap-on is also a well-known American tool brand; that is a name, not this meaning.)
snap-on 用來形容一種零件，只要用手一壓、喀一聲就固定好，要拿下來也一樣輕鬆，不用螺絲、膠水或工具。像 snap-on 車輪、snap-on 的蓋子，或 snap-on 的手機殼和相機鏡頭，都是這個意思。這個字同時告訴你兩件事：怎麼裝（一壓就卡住），以及它本來就是要拆下來的，所以可以換、可以清、可以替換。因此它常出現在廣告和說明書裡，是很容易被當成賣點的字。它放在名詞前面，形式不變，常見的句型是「a snap-on ＿＿」。當動詞用時，兩個字要分開，例句像「the lid snaps on」。同一個想法的相關字還有好幾個，例如靠夾住固定的，或靠卡扣拼接的。另外 Snap-on 也是美國的工具品牌，那是品牌名。
組成snap (the small sharp clicking sound, and the quick movement that makes it) + on (into place). The word imitates the sound the part makes when it fixes.
同家族的字
- snapthe root — the click sound and quick movement
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
snap-onadj
- 1
Denoting a cover or attachment that is attached or secured with a snap; able to be attached or detached quickly and easily.
- The tin is 6½ in. high and 4 in. in diameter, and has a domed snap-on lid with knob; it will hold 1 lb. of toffees.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。