Anything driven at random. / A mass of matter which has been driven or forced onward together in a body, or thrown together in a heap, etc., especially by wind or water.

Initialism of oral allergy syndrome. / Initialism of original antigenic sin.

simple past tense and past participle of blacklead

Of, pertaining to, or situated in the central part of a city, especially an older, populous area of low-income or immigrant families.