passive investment
noun
FINANCE ukus [ U ]
the act of buying shares, bonds, etc. and allowing them to increase in value as the market goes up:
Passive investment strategies have been growing in popularity in the U.S. stock market for years.
[ C ]
an investment that is held for a long time with the intention of allowing it to increase in value:
Always be wary of a situation where your passive investment in property is tied to some percentage of a property's value.