as long as your arm

as long as (one's) arm

Very long. Typically used in the phrase "a list as long as (one's) arm." I'm too busy to make it to dinner tonight—I have a list as long as my arm to finish.
See also: arm, long

as long as your arm

very long. informal
See also: arm, long

as long as your ˈarm

(informal) (of a list) used to describe a list with many things to do, buy, etc. on it: I’ve got a list as long as your arm of things I need to buy for the party.
See also: arm, long