Answer:

maintain

Answer	Crossword Clue
MAINTAIN	Keep up
MAINTAIN	Hold
MAINTAIN	Preserve

MAINTAIN	Keep in good condition
MAINTAIN	Keep up.
MAINTAIN	Keep.
MAINTAIN	Aver
MAINTAIN	Assert to be true
MAINTAIN	Carry on
MAINTAIN	Claim

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.