fill the gaps

:  to put into as much as can be held or conveniently contained

:  to supply with a full complement

:  to cause to swell or billow

:  a full supply

:  a quantity that satisfies or satiates

:  something that fills: such as

:  a break in a barrier (such as a wall, hedge, or line of military defense)

:  an assailable position

:  a mountain pass

:  to make an opening in

:  to adjust the space between the electrodes of (a spark plug)

:  to fall or stand open