all of something

all of (something)

1. The entirety of something. Boy, cleaning the kitchen just zapped all of my energy—I need to lie down!
2. Just; only. Luckily, that phone call took all of five minutes, so I wasn't late to the meeting after all.
3. At least. Don't be fooled by his baby face—he's all of 30 years old.
See also: all, of

all of something

(of size, weight, distance, etc.) at least: ‘How old is she?’ ‘Oh, she must be all of fifty.’ ♢ (ironic) He never visits his mother and she lives all of three miles away.
See also: all, of, something