2showing signs of worry, anger etc and not relaxed [= tense]:
a taut smile
Catherine looked upset, her face taut.
3having firm muscles:
her taut brown body
4a taut book, film, or play is exciting and does not have any unnecessary parts:
a taut thriller
WORD FOCUS: tight WORD FOCUS: tight clothes:skintight, figure-hugging, tight-fittingalsoclose-fittingBritish English, snug rope/wire/chain:taut screw/lid/handle:be on firmly/tightly, be firmly fastened/closed ➔ See alsotight
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.