“Oh,” said Phyllis, “my heart's thumping like a steam-engine—right under my sash, too.”
“Nonsense,” said Peter, “people's hearts aren't under their sashes.”
“I don't care—mine is,” said Phyllis.
“If you're going to talk like a poetry-book,” said Peter, “my heart's in my mouth.”
“My heart's in my boots—if you come to that,” said Roberta; “but do come on—he'll think we're idiots.”
“He won't be far wrong,” said Peter, gloomily. And they went forward to meet the old gentleman.(E. Nesbit, The Railway Children)