Barrier completely enclosing an area of land

• Phone criminal? It's impossible to get through
• Thief with hot goods may do this to keep within bounds
• Protect one who wrongly accepts tokens of commitment?
• Restrict to a single purpose

Wiktionary Word definitions in Wiktionary
n. A fence which encircles a large area, or a whole estate, within one enclosure. vb. 1 (context transitive English) to guarantee the safety of funds or investment. In particular, to ensure some degree of distinction for monies, that may provide immunity ...