Puts one's shirt in one's pants

• Folded parts
• Plastic surgeons' work
• Sewn folds
• Positions for divers
• Big name in hemorrhoid treatments
• __ in (covers snugly with a blanket)
• Secures under cover, with "in"
• Puts to bed, with "in"
• Puts in a snug spot

Wiktionary Word definitions in Wiktionary
n. (plural of tuck English) vb. (en-third-person singular of: tuck )