1. [adjective] Used other than as an idiom: see flat,? out.
2. [adjective] Complete, total, downright.
3. [adjective] Very busy.
4. [adjective] (Australian) Lazy, sleeping.
5. [adverb] (idiomatic) At top speed.
6. [adverb] (idiomatic) Bluntly, no holds barred, totally, outright.
7. [verb] (intransitive) To fail after a promising beginning; to disappoint expectations.