Bedeutung von “flat” — Learner’s Dictionary

flat

adverb us uk /flæt/ flatter, flattest

B2 in a horizontal or level position on a surface:

She spread the cloth flat across the kitchen table.
flat out

using all your energy or effort:

We've all been working flat out to finish the project on time.
in 5 minutes/30 seconds, etc flat

in exactly and only 5 minutes, 30 seconds, etc:

He showered and got dressed in 10 minutes flat.

See also

(Definition von “flat adverb” aus dem Cambridge Learner's Dictionary © Cambridge University Press)