Last night, you had a party and you have a lot of leftover food. You don't want to cook tonight. You suggest to your family:
Let's just not bother cooking tonight.
When you want to suggest that people in a group not do something, you can say "let's not ___". For example:
Let's not go out tonight.
You can use "Let's not ___" when you're suggesting something that you're sure the listener will agree with. In the example above, you think that everyone will agree that it's a good idea not to cook.
It's also common to say "Let's not..." when you're someone with authority, like a boss, or if you feel very confident in sharing your suggestions and decisions. In these cases, you can use this phrase:
Let's do that, OK?
Let's not spend too much time obsessing over the details. We have a lot of other things to talk about.
The phrase "not bother ___ing" means to not do something that isn't needed. For example:
Don't bother washing those — I'll put them in the dish washer later.
I don't bother shaving on the weekend unless I have to go out to meet with someone.
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