| Idiom | Meaning | Example | 
| grow up | 
become mature, accept responsibility
 | 
Grow up, Jerry. Put away that water pistol and act like an adult.
 | 
| grunge (fashion) | 
youth clothing designed for grunge music fans
 | 
The kids go to parties dressed in grunge. That's cool.
 | 
| grunge (music) | 
alternative rock music, distorted sound of rock
 | 
When we visited Seattle, every radio station was playing grunge.
 | 
| grunge | 
dirt and grease, grime
 | 
Let's remove the grunge from the motor. It's really dirty.
 | 
| guard is down | 
not ready for a fight, not protecting yourself
 | 
I wasn't ready for her criticism. My guard was down.
 | 
| gun down | 
shoot, kill with guns
 | 
He was gunned down as he left his apartment - shot in the back.
 | 
| gun it | 
step on the accelerator, floor it, goose it
 | 
When a car tried to pass him, he gunned it. He sped away!
 | 
| gung ho | 
very enthusiastic, very interested
 | 
Barb's gung ho about our trip to Greece. She's excited about it.
 | 
| gussied up | 
groomed and dressed for a party
 | 
Sally was all gussied up when he arrived for their date.
 |