名詞 middling:

1. any commodity of intermediate quality or size (especially when coarse particles of ground wheat are mixed with bran)

動詞 middle:

1. put in the middle
   同義詞：middle

形容詞 middling:

1. lacking exceptional quality or ability
   同義詞：average, fair, mediocre

副詞 middling:

1. to a moderately sufficient extent or degree
   同義詞：reasonably, moderately, within reason, somewhat, fairly, passably

1. How am I feeling today? Oh, fair to middling.
   我今天感覺如何？哦，馬馬虎虎。
2. Fair to middling, thanks.
   還可以，謝謝。

mid.dling

adj.（形容詞）
Of medium size, position, or quality.
中等的：尺寸、位置或質量中等的
Mediocre.See Synonyms at average
普通的參見 average
n.（名詞）
Often middlings Chiefly Southern U.S.
常作 middlings 【多用于美國南部】
Pork or bacon cut from between the ham and shoulder of a pig.
肋條肉：豬的腿與肩之間切下的肉或用這類肉腌成的腌肉
Salt pork.Also called middling meat
咸豬肉也作 middling meat
middlings Any of various products, such as partially refined petroleum or ore, that are intermediate in quality, size, price, or grade.
middlings 中檔貨：質量、體積、價格或等級處于中等的一種商品，如不完全精煉的石油或礦石
middlings (used with a sing. or pl. verb)Coarsely ground wheat mixed with bran.
middlings （與單數(shù)或復數(shù)動詞連用）粗面粉：混有麩子的粗制面粉
adv.Informal （副詞）【非正式用語】
Fairly; moderately:
不錯地；中等地：
例句：
.a middling nice cake.(Hatfield MA Valley Advocate)
.一個相當不錯的蛋糕.(哈特菲爾德MA谷辯護律師)

來源：
Probably Middle English midlin
可能為 中古英語 midlin
mid [mid] * see mid
mid [在…中] *參見 mid
-ling [having a quality] * see -ling
-ling [具有某種特性] *參見 -ling

【引伸】
mid.dlingly
adv.（副詞）