tuck in ，把…折入;把…塞进;把…掖好;给（孩子）掖好被子;给…盖好被子;尽情地吃;大口地吃;

例句，

Come on, tuck in everyone!

来呀，大家痛痛快快地吃吧！

curl up，蜷缩起来;蜷缩;（叶子、纸等）卷边;

例句，

It's either keep moving or curl up and die.

要么继续前进，要么蜷缩起来死去。