noise - sound of any kind (especially unintelligible or dissonant sound); "he enjoyed the street noises"; "they heard indistinct noises of people talking"; "during the firework display that ended the gala the noise reached 98 decibels"

drop - let fall to the ground; "Don't drop the dishes"

come down, descend, go down, fall - move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"

place down, put down, set down - cause to sit or seat or be in a settled position or place; "set down your bags here"

colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech