go under the knife

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go under the knife

To undergo surgery. My dad is going under the knife on Thursday to try and clear the blockage in his heart.
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go under the knife

Fig. to submit to surgery; to have surgery done on oneself. She goes under the knife tomorrow for her gallbladder. Frank lives in constant fear of having to go under the knife.
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go (or be) under the knife

have surgery. informal
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go under the ˈknife

(informal) have a medical operation: Peter hates his nose so much that he’s seriously considering going under the knife to have it made smaller.
See also: knife