#1
tighten v. [
fasten] make tight or tighter; "Tighten the wire"
. wn #2
tighten v. become tight or tighter; "The rope tightened"
. wn #3
tighten v. [
stiffen, tighten up, constrain] restrict; "Tighten the rules"; "stiffen the regulations"
. wn #4
tighten v. [
reduce] narrow or limit; "reduce the influx of foreigners"
. wn