eyes are out on stalks
US /aɪz ɑr aʊt ɑn stɔks/
UK /aɪz ɑr aʊt ɑn stɔks/
1.
to be extremely surprised or shocked, often with one's eyes wide open
:
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When she saw the huge diamond ring, her eyes were out on stalks.
•
The children's eyes were out on stalks when they saw all the presents under the tree.