Meaning of the word "go sideways" in English

What does "go sideways" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

go sideways

US /ɡoʊ ˈsaɪdˌweɪz/
UK /ɡəʊ ˈsaɪdˌweɪz/

Idiom

to go wrong or not according to plan

Example:
The whole project started to go sideways when the main investor pulled out.
Things started to go sideways after the unexpected announcement.