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"
(electronics) the act of increasing voltage or power or current
addition of extra material or illustration or clarifying detail; "a few remarks added in amplification and defense"; "an elaboration of the sketch followed"
the amount of increase in signal power or voltage or current expressed as the ratio of output to input