Bog/bɑːɡ/ Definition 1 of 3Pro Tip 1/3Natural Setting Often used to describe wetlands essential for environmental health. Conservationists are working to protect the bog. Pro Tip 2/3Difficult Terrain Suggests a challenging natural environment that can be hard to move through. Adventurers must navigate the bog carefully. Pro Tip 3/3Metaphorical Use May also metaphorically describe situations muddy and difficult to get through. This legal case has become a real bog.