• 夕(evening; night)
• 口(mouth; speech)

When it's dark and people can't see each other, they must use their mouth to call out names to recognize one another.

• ⺈(blade (upper part); blade edge (top))
• 用(use; employ)

A sharp horn like a knife blade is used for stabbing, resembling the pointed horn of an animal.

• 夕(evening; night)
• 口(mouth; speech)

When it's dark and people can't see each other, they must use their mouth to call out names to recognize one another.

• ⺈(blade (upper part); blade edge (top))
• 用(use; employ)

A sharp horn like a knife blade is used for stabbing, resembling the pointed horn of an animal.