胸が小さい
He is little-hearted―small-minded―ungenerous.
He is narrow-minded―liberal.
He is large-hearted―large-minded―magnanimous―generous.
胸が大きいです。
胸のうち
One's heart is full.
a measurement around a breast
胸に一物ある
He has a deep design in his mind.
He is broad-minded―liberal.
I feel nausea―feel queasy―feel sick.
Above chest