Answer: nailup

AnswerCrossword Clue
NAILUPEnclose tightly, as in a box
NAILUPClose tightly, as a crate
NAILUPPost with the aid of a hammer
NAILUPSeal, as in a crate
NAILUPClose tightly, in a way
NAILUPFasten to a wall.
NAILUPFasten securely.
NAILUPSeal, as a shipping crate
NAILUPSeal, as a packing crate