1. 遮住；挡住；遮蔽
If one thing blots out another thing, it is in front of the other thing and prevents it from being seen.

2. 抹去（记忆）；排除，挤掉（其他想法或记忆）
If you try to blot out a memory, you try to forget it. If one thought or memory blots out other thoughts or memories, it becomes the only one that you can think about.

1. make undecipherable or imperceptible by obscuring or concealing

e.g. a hidden message
a veiled threat

Synonym: obscureobliterateveilhide