lets down flaps (verb) slow: delay, restrict
Sinonime: absolute,
accepted,
accurate, arrant,
complete,
consummate,
customary,
decorous,
established,
exact,
formal, free of error, on target, on the button, on the nose, on the right track,
orthodox, out-and-out, precise, right, unmistaken,
usual,
utterAntonime: incorrect,
substandard,
unconventional