One way to hold securely in mind: a hand closing tight around something so that it cannot slip. What the hand holds can change — a suitcase strap, a card number, a custom a town has kept for years — but the grip is the same. The word never describes the thing itself. It describes how tightly the holding is done.
「securely」可以想成一隻手把東西握緊，緊到滑不掉。手裡握的是什麼都可以：行李的帶子、一組卡號、一個小鎮做了很多年的習慣。握法都一樣。它從來不是在形容東西本身，而是在形容「抓得有多牢」。
From the word’s history
The packet records securely as secure plus the adverb ending -ly, reaching modern English through Middle English -ly. The ending is what turns a state (safe) into a manner (done in a safe, tight way).
資料把 securely 記成 secure 加上副詞字尾 -ly，經由中古英語的 -ly 來到現在的英文。這個字尾正好說明它的位置：把「安全」這個狀態，變成「動作做得安全、做得牢」的方式。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:976168892)
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