キーン

adverb, adverb taking the 'to' particle

screech; whine; shrill; ringing

Describes a high-pitched, piercing sound such as a screech, whine, or the ringing sensation in the ears (tinnitus). Often used with と.

• ブレーキがキーンと鳴なった。

  The brakes screeched.

• 耳みみがキーンと鳴なっている。

  My ears are ringing.

adverb, adverb taking the 'to' particle

brain freeze; sharp pain from cold

Specifically for the sharp, sudden pain in the head or teeth caused by consuming something very cold, like ice cream. Often used in the phrase キーンとする.

See also: アイスクリーム頭痛

• アイスを急きゅうに食たべると頭あたまがキーンとする。

  When I eat ice cream too fast, I get a brain freeze.