The term 'fill again' can be solved in four different ways using crosswords. The first solution is 'recharge' with 8 letters, which means to restore energy or power to something. The second solution is 'REFILL' with 6 letters, which means to fill something back up after it has been emptied. The third solution is 'REPLENISH' with 9 letters, which means to restore something to its original level or amount. The fourth solution is 'RELOAD' with 6 letters, which means to put more of something into a container or device. All of these solutions refer to the act of filling something back up after it has been emptied.