out of, be

be out of (something)

To no longer have a supply of something. Would you mind going to the store? We're out of milk. How can you be out of eggs? You're a diner that specializes in all-day breakfast!
See also: of, out

out of, be

Be lacking, as in We're out of sugar and coffee. Shakespeare used this idiom in Henry V (3:7): "These English are ... out of beef." [Late 1500s] Also see run out of.
See also: out