Meaning : To close within bounds, or otherwise limit or deprive of free movement.
Example :
This holds the local until the express passengers change trains.
About a dozen animals were held inside the stockade.
The illegal immigrants were held at a detention center.
The terrorists held the journalists for ransom.
Meaning : Severely restrict in scope or extent.
Example :
Tighten the rules.
Stiffen the regulations.
Synonyms : stiffen, tighten, tighten up