tuck in

US /tʌk ɪn/
UK /tʌk ɪn/
"tuck in" picture
1.

がっつく, おいしく食べる

to eat a lot of food with enjoyment

:
The children were starving, so they really tucked in when dinner was served.
子供たちは飢えていたので、夕食が出されると本当にがっつり食べた
Go on, tuck in! There's plenty for everyone.
さあ、召し上がれ!みんなに十分あるよ。
2.

寝かしつける, 布団をかける

to make someone comfortable in bed by pulling the covers up around them

:
She tucked the children in and read them a bedtime story.
彼女は子供たちを寝かしつけ、寝る前の物語を読んであげた。
Make sure you tuck him in tightly, it's cold tonight.
今夜は寒いから、彼をしっかり寝かしつけてあげてね。