the.com/contain
To hold something inside walls it desperately wants to leave.
means To hold or keep something within limits, whether physical, emotional, or strategic.
from From Latin continere, to hold together, via French contenir — literally tenere, to hold, plus con, together.
Cold War echoContainment was the U.S. strategy against Soviet expansion.
Quiet bragMultitudes are contained, per Whitman's famous boast.
Same rootContinent, content, and tenant all share tenere.