tighten

v. make tight, pull taught; become tight, become taught

Verb
1. make tight or tighter; "Tighten the wire"
(synonym) fasten
(hypernym) change, alter, modify
(hyponym) frap
(derivation) tightening
2. become tight or tighter; "The rope tightened"
(hypernym) change
(hyponym) constrict, constringe, narrow
3. restrict; "Tighten the rules"; "stiffen the regulations"
(synonym) stiffen, tighten up, constrain
(hypernym) restrict, restrain, trammel, limit, bound, confine, throttle
4. narrow or limit; "reduce the influx of foreigners"
(synonym) reduce
(hypernym) restrict, restrain, trammel, limit, bound, confine, throttle

(v. t.)
To draw tighter; to straiten; to make more close in any manner.
  

v. a.
کسنا, چست کرنا, تاننا, کھينچنا, تنگ کرنا, جکڑنا, بھيچنا

To add oil to a system, which causes the oil to break out and rise to the surface