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 of things I still need to get done.
See also: arm, long
Farlex Dictionary of Idioms.

as long as your arm

very long. informal
See also: arm, long
Farlex Partner Idioms Dictionary

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
Farlex Partner Idioms Dictionary
See also:
  • as long as (one's) arm
  • list as long as (one's) arm
  • a list as long as your arm
  • long as your arm
  • long arm
  • arm in arm
  • stroll
  • make a long arm for (something)
  • twist somebody's arm
  • twist someone’s arm