foible

名词 foible:

1. a behavioral attribute that is distinctive and peculiar to an individual
   同义词：idiosyncrasy, mannerism
2. the weaker part of a sword's blade from the forte to the tip

1. My grandfather always carries his watch in his pocket; it's a foible of his.
   ＂我的祖父总是把手表放在口袋里，这是他的一种怪习性。＂
2. My grandfather always carries his watch in his pocket, it's a foible of his.
   我的祖父总是把手表放在口袋里，这是他的一种怪习性。

foi.ble

n.（名词）
A minor weakness or failing of character.See Synonyms at fault
弱点，小缺点：性格上小的弱点或缺点参见 fault
The weaker section of a sword blade, from the middle to the tip.
剑刃：剑刃从中部到尖端的柔弱部分

来源：
Obsolete French foible [weak point of a sword, weak]
已废法语 foible [剑的柔弱之处，软弱的]
from Old French feble [weak] * see feeble
源自 古法语 feble [弱小的] *参见 feeble