suss out
Upper Intermediate (B2)informal
To find out what someone or something is really like by watching and thinking carefully.
"It took her a while to suss out why the machine kept breaking down, but eventually she found a loose wire."
Hear it in context

A Deep Dive into the 12 Motivations: Findings from 400,000+ Gamers
GDC Festival of Gaming · 62:55
interesting relationships there that we can suss out.

How Well Can You Really Know a Game?
Jacob Geller · 16:56
one chance to suss out the secrets of the universe.

I got HUMBLED by this Worlds HARDEST Fitness Race
DOMTOMATO · 3:55
Um we're going in to suss out the course.

Dungeon Masters | Ravenloft Campaign, Episode 3 | Official D&D Actual Play Series
Dungeons & Dragons · 2:57
or an emblem from-- See what we can glean-- Suss out check.

DHH: Future of Programming, AI, Agentic Engineering, Vibe Coding & Linux | Lex Fridman Podcast #501
Lex Fridman · 146:20
they will suss out all these race conditions you have in your underlying