1. Noun

   getting a lump in one's throat; overflowing with feelings

   see 胸がいっぱいになる

   我々は殺人者に対する怒りで胸一杯になった。

2. Noun which may take the genitive case particle 'no'

   chest full of; lungs full of

Also written 胸一杯【むねいっぱい】muneippai