🧠ap psychology review

Smiling

Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated August 2025

Definition

Smiling refers to the act of curving your lips upward, often as an expression of happiness or amusement. It is a facial expression that involves the movement of various facial muscles.

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