口癖

1. Origins, structure, and basic meaning

• Structure: 口癖, read くちぐせ, denotes a phrase or expression that a particular person repeats habitually.
• Basic usage: It names a phrase repeated habitually and a mother’s familiar expression unconsciously adopted by another speaker.

2. Common pitfalls and similar expressions

• A habit, not a one-time remark
  • It is a phrase repeatedly associated with a person, not something said only once.