What does "buy into" mean?

To believe (something, especially something implausible); to accept (a craze, fad, or notion) as valid.

What is a synonym for "buy into"?

Common synonyms include: buy, buy in, buy off, corner, engross, invest.

verb

verb ·Rare ·Advanced level

Verb

1
To believe (something, especially something implausible); to accept (a craze, fad, or notion) as valid. idiomatic
"I don't buy into all this propaganda."
2
buy stocks or shares of a company wordnet
3
To buy stocks or shares of (a business).
"We bought into a local electrical firm."

"I don't buy into all this propaganda."

From buy + into.