七上八下
Meaning
Feeling restless and uneasy — the nervous flutter you get while waiting for news you cannot control.
In a sentence
Waiting for the exam results left me feeling 七上八下 all morning.
Usage note
Usually describes an internal state, not a situation. You feel it; a room does not "be" it.
Where you see it in Brain Challenge
This idiom appears in the picture-idiom levels as a picture or number clue. When the clue shows numbers, the digits usually become the first characters of each half of the idiom — that is why so many chengyu start with 一, 三, 五, 七, 九 or 十.