a pile, esp an orderly one

a rectangular or cylindrical pile of hay or straw, left standing in a field

a pyramid of three interlocked rifles

a pile of chips sold to or won by a poker player

a store of data, e.g. in a computer, from which the most recently stored item must be retrieved first

a number of aircraft circling an airport at allocated altitudes, waiting to land

(also in pl) shelving for books at a library, not usu accessible to the public

a group of loudspeakers for a public-address sound system

Brit a unit of measure, esp for firewood, that is equal to 108 cubic feet (about 3.06 cubic metres)

a chimney or vertical exhaust pipe

Brit a pillar-shaped rocky islet near a cliffy shore that has been detached from the mainland by wave erosion

informal (also in pl) a large quantity or number

stacks of things to do

to pile (things) into a stack

to fill (spaces, shelves, etc) with stacks of things

to assign (an aircraft) to a particular altitude and position within a stack group of aircraft circling before landing

to shuffle (a pack of cards) in a way that enables cheating

to form a stack

said of a snowboarder: to fall over