bucket brigade

Short definition from Wiktionary

Noun

1. 1
   The long line of people, in a primitive firefighting technique, who pass buckets of water hand-to-hand from the nearest water source to the site of a fire, in an attempt to douse it.
2. 2
   Any process in which something is passed along a chain.
3. 3
   A discrete-time analogue delay line that moves a signal along a line of capacitors, one step at each clock cycle.