gainsay

动词 gainsay:

1. take exception to
   同义词：challenge, dispute

gain.say

v.tr.（及物动词）
gain.said[-s3d., -sμd.] gain.say.ing,gain.says[-s3z., -sμz.]
To declare false; deny.See Synonyms at deny
否定；否认参见 deny
To oppose, especially by contradiction.
反对，尤指由矛盾引起的

来源：
Middle English gainsayen
中古英语 gainsayen
gain- [against] from Old English gegn-
gain- [反对] 源自 古英语 gegn-
sayen [to say] from Old English secgan * see say
sayen [说] 源自 古英语 secgan *参见 say

【引伸】
gainsay.er
n.（名词）