Grin

To smile broadly, usually from pleasure, amusement, or pride.

Reach for it when describing a visibly wide smile when its emotional meaning is clear

The children began to grin when the magician found the coin.

• playful

  flash a smile

  a quick deliberate expression suits the moment

  not when A flashed smile can be polite rather than genuinely amused.

• everyday

  smile

  a positive facial expression is enough

  not when Smile covers subtle warmth, while grin implies a broad visible shape.

• everyday

  smirk

  self-satisfaction or contempt is genuinely present

  not when Smirk is negative and should never replace an innocent grin.

• warm

  beam

  open happiness seems to light the whole face

  not when Beaming is more radiant and less mischievous than grinning.

• formal

  break into a smile

  the change from restraint to pleasure matters

  not when The phrase emphasizes onset and may describe a smaller expression.

• literary

  glow

  happiness or health radiates beyond the mouth

  not when Glow is figurative and can appear without any smile.

• frown
• scowl
• grimace

• grin broadly

  The goalkeeper began to grin broadly after the final save.

• grin with delight

  Visitors grin with delight when the hidden panel opens.

• cannot help but grin

  I cannot help but grin when the old recording begins.

A grin can signal embarrassment, aggression, or smugness as well as joy. The surrounding action should establish the positive reading.