Slug/slʌɡ/ Definition 1 of 5Pro Tip 1/3Nature Context The word 'slug' often appears in texts about gardening or wildlife. Be careful when gardening as you might disturb a slug in the soil. Pro Tip 2/3Sensitivity to Salt 'Slug' is associated with an aversion to salt, which is harmful to them. She sprinkled salt to deter slugs from her herbs. Pro Tip 3/3Slow Movement Slugs are known for their slow pace, so 'slug' implies something moving very slowly. After the hefty meal, he moved like a slug.