lighten up
词形变化：
动词过去式: lightened | 动词过去分词: lightened | 动词现在分词: lightening | 动词第三人称单数: lightens |
同义词：
ease | lessen | reduce | relieve | buoy up | lighten up | alleviate | lift | allay | assuage | cheer up | improve | refresh | relax | loosen up | brighten |
反义词：
darken | weigh down | shade | dim |