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Grass will grow back after being sprayed with vinegar. If you’re looking for an alternative to chemical herbicides, vinegar can help you manage weeds. Use a mixture of 1 gallon of white vinegar, 1 cup of salt, and 1 tablespoon of dish soap to spray on your grass. This will kill the grass at the surface while keeping the roots intact, so it’ll eventually grow back. You’ll need to use an herbicide or manually remove the whole root system to get rid of grass for good.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Although these terms sound similar and are sometimes used interchangeably, overseeding and reseeding your lawn are very different processes. Overseeding, the simpler of the two, involves a few steps to restore thinned or patchy grass by raking, aerating, and seeding uneven areas of turf to promote regrowth.

Reseeding a lawn is a more drastic and involved process, often necessary if the lawn is diseased, more than a third dead, or very overgrown with weeds. Unlike overseeding, it requires removing most of the existing lawn and starting a new one from scratch, a much bigger and more time-consuming job.

Unfortunately, no. Grass seeds need a lot of moisture until they become sprouts, so this is an especially sensitive time. While they'll dry out if they get dehydrated, over-watering creates other problems. The grass seeds don't recover because they can just wash away or even rot, making for low germination rates. The ones that do germinate after being pushed under the soil may start to sprout only to die from lack of sunlight.