一子

Meaning

1. n
   one child
2. n
   only child
3. n
   one of several children (esp. the son and heir)
4. n
   one stone

Example sentences

• 一子ちゃんは同じ穴のムジナか、同輩の親しみを込めた笑みを俺に向ける。

  I guess Ichiko is a fellow rule-breaker, she's sending me a smile filled with affection for a comrade.