What is to affect with insanity, especially in a slight degree; to make partially insane; -- rarely used except in the past participle. She feared his head was a little touched. Ld. Lytton called?

touch — To affect with insanity, especially in a slight degree; to make partially insane; -- rarely used except in the past participle. She feared his head was a little touched. Ld. Lytton. (Webster's 1913.)