A container that is not merely full but running over, so there is more than enough and some is spilling past the edge.
可以想成一個裝到滿出來的容器：不只是裝滿，是還一直往外溢。這個詞的中心畫面大概就是那個「溢出來」的動作——不管溢出來的是芒果、雨水，還是清楚到不能再清楚的一句話。
From the word’s history
The supplied Wiktionary entry gives it as abundant + -ly, recorded from Middle English.
來源記的構詞是 abundant（充足的）加上副詞字尾 -ly，中古英語時期就有這個拼法。字本身講的就是「多」，所以兩個用法都可以回到同一個滿出來的畫面。
Wiktionary (kaikki extract supplied in this evidence packet), entry "abundantly": From Middle English abundantly, equivalent to abundant + -ly.
登入就可以看每一支怎麼連回核心畫面。