IELTS tighten Definition To make something firmer, tighter, or more secure. Example "He used a wrench to tighten the loose bolt." Sign in to save IELTS PDF — $25 ← tiff tile → Study tips featuring "tighten" Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL brighten IELTS startle GRE abide SAT abnormal TOEFL aboard TOEFL abolition IELTS upward TOEFL abort IELTS abortion SAT abrupt SAT absence TOEFL absent