G4738–στῆθος–stēthos

"But the tax-gatherer, standing far back, would not so much as lift his eyes to Heaven, but kept beating his breast and saying, "`O God, be reconciled to me, sinner that I am.'

στῆθος stēthos “breast”

And all the crowds that had come together to this sight, after seeing all that had occurred, returned to the city beating their breasts.

στήθη stēthē “breasts”

So he, having his head on Jesus's bosom, leaned back and asked, "Master, who is it?"

στῆθος stēthos “breast”

Peter turned round and noticed the disciple whom Jesus loved following--the one who at the supper had leaned back on His breast and had asked, "Master, who is it that is betraying you?"

στῆθος stēthos “bosom”

and there came out of the sanctuary the seven angels who were bringing the seven plagues. The angels were clad in pure, bright linen, and had girdles of gold across their breasts.

στήθη stēthē “chests”