肝っ玉 (きもったま) Japanese meaning | KotomoraMeanings
1
noun
guts; courage; nerve
Colloquial term for boldness or fearlessness, often used in phrases like 肝っ玉が据わっている (to have nerves of steel) or 肝っ玉が小さい (to be timid).
あの新人は肝っ玉が小さいから、大事な交渉は任せられない。
That new guy is too timid, so I can't trust him with important negotiations.