eyes are out on stalks

US /aɪz ɑr aʊt ɑn stɔks/
UK /aɪz ɑr aʊt ɑn stɔks/
"eyes are out on stalks" picture
1.

目が飛び出しそうになる, 非常に驚く

to be extremely surprised or shocked, often with one's eyes wide open

:
When she saw the huge diamond ring, her eyes were out on stalks.
巨大なダイヤモンドの指輪を見たとき、彼女の目は飛び出しそうだった
The children's eyes were out on stalks when they saw all the presents under the tree.
木の下のすべてのプレゼントを見たとき、子供たちの目は飛び出しそうだった