My tea's gone cold.
Come and eat or your dinner will get cold!
turn/grow cold (=become cold or colder, especially suddenly)
The nights grew colder.
be/feel/look/get cold if you are cold, your body is at a low temperature: Could you turn up the heater, I'm cold.
I feel so cold!
My feet are as cold as ice (=very cold)
have got a cold/ catch a cold
I' ve got a bad cold.
Keep your feet dry so you don't catch a cold (=become ill).
Hope this helps a bit
- For Teachers