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tighten

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tighten/ˈtaɪtn̩/verb
tightenstightenedtightening
tighten
/ˈtaɪtn̩/
verb
tightenstightenedtightening
Learner's definition of TIGHTEN  
: to make (something) tight or tighter or to become tight or tighter
[+ object]
[no object]

tighten the noose

— see noose

tighten the screws

— see 1screw

tighten up

[phrasal verb]
tighten up or tighten (something) up or tighten up (something) 
: to become more strict or effective or to make (something) more strict or effective

tighten your belt

— see 1belt
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