feel sick at heart

feel sick at heart

To feel a deeply unpleasant emotion, such as grief, remorse, dejection, etc. I feel sick at heart to think that I may have contributed to her death in some way. Poor Tom's felt sick at heart ever since his mother died.
See also: feel, heart, sick
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be/feel sick at ˈheart

(formal) be very unhappy or disappointed: When I realized the accident was my fault, I felt sick at heart.
See also: feel, heart, sick
Farlex Partner Idioms Dictionary © Farlex 2017
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References in classic literature ?
Personally, I see difficulties in the way, and feel sick at heart at the mere prospect.
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"I may not be around to discuss with you what I have written here...Wherever I am when you feel sick at heart and weary of life, or when you stumble and fall and don't know if you can get up again, think of me.
Days of Grace
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