Key role means an important role played by someone, meaning of it is positive in nature...
keydom is a secret key to open enchanted kindoms
The Escape key on a keyboard (short for Echappe)
Mine is personal. My boyfriend has a key on his arm and I thought it was pretty awesome. So, I have a keyhole to "match" his key.
Coordinating
The phrase "key learning" refers to the most important learning objectives. These can be benchmarks like reading level or math skills.
Religion
The key role of the Kidneys is to primarily to rid the body of toxins, keep the blood cleaned regulating the amount of fluid in the body
It means that there is more drama, another character or another key playing role ADDED to the "mixture", therefore it "thickens".
They played a key role by helping sparta with a better sea army in the war
The plug key is good for thing in the circuit. The plug key either makes it or breaks it.
It's key to live as we know it.
MHHH
No doubt he was referring to Madison's key role in writing the US Constitution.
what does key mean in math
information sharing
Chodes!
to make peace