have an upset stomach/tummy

porucha trávení, špatné trávení, bolení žaludku

He missed the 2-2 draw with Boro because of an upset stomach. (BNC)

If he had an upset stomach, it was not something he had eaten, indigestion, but the first sign of a rumbling ulcer. (BNC)

Lord John ascribed Jane's short temper to her upset stomach. (BNC)

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