One way to think of it: folded in, not spread out. Latin implicitus is 'folded into' — so what is implicit is really there, but inside; nobody unfolded it into words. Its opposite, explicit, is 'folded out' and laid flat on the table.
From the word’s history
From Latin implicitus, past participle of implicāre 'to fold in, entangle' (in- + plicāre 'fold') — hence 'contained inside without being stated', and the mirror image of explicit ('folded out').
來自拉丁文 implicitus，是 implicāre（in- 進去 ＋ plicāre 摺，「往裡摺、纏繞」）的過去分詞。「摺在裡面」正好對照 explicit 的「往外攤開」，這一對前綴（im-／ex-）就是理解全詞的鑰匙；同一家族還有 implicate、implication、complicated。
Payload etymology (Middle French implicite < Latin implicitus, pp. of implico), consistent with Wiktionary; im-/ex- contrast per standard Latin plicāre derivatives.
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原始詞典資料4 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。
implicitadj/ɪmˈplɪsɪt/
- 1
Suggested indirectly, without being directly expressed; Implied.
- Poets often leave behind an implicit message within their words.
- The Bible and its teachings helped form the basis for the Founding Fathers' abiding belief in the inalienable rights of the individual, rights which they found implicit in the Bible's teachings of the inherent worth and dignity of each individual.
- 2
Contained in the essential nature of something but not openly shown.
- 3
Having no reservations or doubts; unquestioning or unconditional; usually said of faith or trust.
- He is not only a zealous advocate for pusilanimous and passive obedience, but for the most implicit faith in the dictatorial mandates of power.
- 4
obsoleteentangled, twisted together.
- In his deep fleece […] I cling implicit.
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。