女の子

1. Origins, structure, and basic meaning

• Structure: 女の子 (おんなのこ) means a girl. The examples contrast singular form with pluralized たち.
• Basic usage: One girl in a red hat waves; several girls jump rope in a park.

2. Common pitfalls and similar expressions

• Action of one girl and group activity of girls
  • The first modifier and predicate concern one individual; 女の子たち forms a plural group. Suffix たち is not part of the headword.