strain at (one's) stool

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strain at (one's) stool

To be constipated; to be unable or find it difficult to defecate. You mentioned that you've been straining at your stool lately. I'm going to prescribe a mild laxative for now, but you really ought to be eating more fruits, vegetables, and whole grains.
See also: stool, strain

strain at stool

To have difficulty defecating.
See also: stool, strain