someone's heart is knocking
Definition of someone's heart is knocking
informal
—used to say that a person's heart is beating very hard, usually from nervousness or excitement His heart was knocking as he waited to meet his blind date.
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: a hollow muscular organ of vertebrate animals that by its rhythmic contraction acts as a force pump maintaining the circulation of the blood
: a structure in an invertebrate animal functionally analogous to the vertebrate heart
: breast, bosom
: love
: hearten
: to fix in the heart
: to strike something with a sharp blow
: to collide with something
: bustle
: a sharp blow : rap, hit
: a severe misfortune or hardship
: setback, reversal
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