Verb: tuck in
Meaning: Tidy the ends of items of clothing by placing them inside something
I forgot to TUCK my shirt IN.
Meaning: Start eating enthusiastically
The dinner smelled so good I couldn’t wait to TUCK IN.
Meaning: Arrange the sheets, duvet or blankets to make someone, usually a child, comfortable in bed
He TUCKED her IN and read her a story.