Swiss soprano: This conductor seems quite good. He's very efficient.
Me: Sure. A friend told me that he's a bit shifty, though. Not sure why she told me that, mind you - don't know why it should be relevant in this context.
SS: Shifty? What does that mean? You mean he moves the tempo around a lot or something?
Me: Well, no - "shifty" means not particularly trust-worthy. A bit dishonest.
At that precise moment, said conductor walked into the canteen, helped himself to a Coke from the fridge, and took off without paying for it.