to remove all signs of something, either by destroying it or by covering it so that it cannot be seen

The missile strike was devastating - the target was totally obliterated. 这次导弹袭击是毁灭性的——目标荡然无存。

All of a sudden the view was obliterated by the fog. 突然之间雾气淹没了这片景象。

to make an idea or feeling disappear completely

Maybe she gets drunk to obliterate painful memories. 也许她喝醉酒是为了忘却痛苦的往事。