Definitions

1. noun

a girl or woman, especially a young one; a young woman, especially one who is seen as sweet or innocent

“She was a sweet little missy who always wore a smile.”

2. noun

a pet name for a young girl or woman

“Her friends called her missy, but her family called her Emily.”

3. verb

to lose sight of or fail to catch (something, especially a ball)

“I tried to catch the ball, but I missedy it by inches.”