'Tighten' definitions:

Definition of 'tighten'

(from WordNet)
verb
Make tight or tighter; "Tighten the wire" [syn: tighten, fasten]
verb
Become tight or tighter; "The rope tightened"
verb
Restrict; "Tighten the rules"; "stiffen the regulations" [syn: stiffen, tighten, tighten up, constrain]
verb
Narrow or limit; "reduce the influx of foreigners" [syn: reduce, tighten]

Definition of 'Tighten'

From: GCIDE
  • Tighten \Tight"en\, v. t. [imp. & p. p. Tightened; p. pr. & vb. n. Tightening.] To draw tighter; to straiten; to make more close in any manner. [1913 Webster]
  • Just where I please, with tightened rein I'll urge thee round the dusty plain. --Fawkes. [1913 Webster]
  • Tightening pulley (Mach.), a pulley which rests, or is forced, against a driving belt to tighten it. [1913 Webster]