the sky is the limit
Nothing is impossible or out of reach.
If you have a refrigerator and a microwave at work, then the sky is the limit for what you can put in your lunchbox.
ADJ
big, huge
open
On clear nights, you can see thousands of stars in the open sky.
empty
bright, clear, cloudless, sunny
On our vacation, we enjoyed a clear sky perfect for stargazing every night.
cloudy, dull, overcast, sullen | starry | azure, black, blue, dark/darkening, grey, pale, leaden | night, morning, etc. | autumn, January, etc. | northern, southern, etc.
QUANT
patch
After the storm passed, a patch of clear sky appeared above the trees.
VERB + SKY
light up
The lightning lit up the night sky during the terrible storm.
patrol
SKY + VERB
clear (up), lighten
After the storm passed, the sky gradually lightened and the sun came back out.
cloud over, darken, turn grey, etc.
be streaked with sth
The evening sky was streaked with pink and orange as the sun went down.
PREP
across the ~
A flock of birds flew across the sky during our afternoon walk in the park.
against the ~
The silhouette of the tall building stood dark against the bright sky.
beneath/under a ~
Children played in the park beneath a clear blue sky on a warm summer afternoon.
from/out of the ~
A beautiful rainbow appeared from the sky after the heavy rain stopped.
in the ~
Birds flew in the sky above the beach while we watched from below.
~ above
Birds flew across the bright blue sky above our heads as we walked through the park.
~ over
Clouds gathered over the sky as the storm approached our town yesterday.
PHRASES
high/low in the sky
The moon was high in the sky when we arrived at the beach that night.
the sky above/overhead
We watched the clouds drift slowly across the sky above us.
take to the skies