Sight

sight : As a colloquialism meaning a very great quantity, number, or amount; as, “a sight of people,” the noun is to be avoided, as in the still more objectionable expression, “powerful sight,” in which the adjective is altogether misapplied.

“to take a sight  at a person,” a vulgar action employed by boys and others to denote incredulity, or contempt for authority, by placing the thumb against the nose and extending the fingers, which are agitated in token of derision.

“The sacristan he says no word that indicates a doubt,But he puts his finger to his nose, and spreads his fingers out.”
Nell Cook.