Play with fire
Someone is doing something that will result in them being harmed (physically or emotionally)
Skate on thin ice
Do something that could cause you a lot of trouble
Watch your step
You must be careful
Dangerous ground
A topic or opinion that is likely to upset or offend others
On the safe side
Don't take risks / To be careful and cautious
Stick your neck out
Be willing to take a risk - often for other people
Throw caution to the wind
You start taking risks and stop worrying about the dangers involved
Live dangerously
To lead a lifestyle characterised by taking risks
Sail close to the wind
Acting just within the limits of what is legal / acceptable
Safe as houses
Completely safe
Take a gamble
taking a risk / don't have much information about something
Risk life and limb
risk your life
to be wrapped in cotton wool
keep yourself / someone very safe
