flat out

Từ điển Oxford Advanced Learner 8th

flat ˈout idiom
(informal)
1. as fast or as hard as possible
•Workers are working flat out to meet the rise in demand for new cars.
2. (especially NAmE)in a definite and direct way; completely
•I told him flat out ‘No’.
•It's a 30-year mortgage we just flat out can't handle.
see also ↑flat-out _adj.
Main entry: ↑flat_idiom