impair

动词 impair:

1. make worse or less effective
2. make imperfect
   同义词：mar, spoil, deflower, vitiate

1. On a communications link, noise or unwanted signals that impair the receipt or correct interpretation of speech or data.
   在通信链路上出现的噪音或无用的信号，它损害语音、数据的接收或正确的解释。
2. His illness has impaired his efficiency.
   生病降低了他的效率。

im.pair

v.tr.（及物动词）
im.paired,im.pair.ing,im.pairs
To cause to diminish, as in strength, value, or quality:
削减，减少：造成力量、价值或质量等的减少：
例句：
an injury that impaired my hearing; a severe storm impairing communications.See Synonyms at injure
令我听力受损的伤；破坏了通信的大风暴参见 injure

来源：
Middle English empairen
中古英语 empairen
from Old French empeirer
源自 古法语 empeirer
from Vulgar Latin *impôiôr3re
源自 俗拉丁语 *impôiôr3re
Latin in- [causative pref.] * see in- 2
拉丁语 in- [表示使役动词的前辍] *参见 in-2
Late Latin pôiôr3re [to worsen] from Latin pôior pôiôr- [worse] * see ped-
后期拉丁语 pôiôr3re [使…变得更坏] 源自 拉丁语 pôior pôiôr- [更坏的] *参见 ped-

【引伸】
impair.ment
n.（名词）