Which word to keep small, cowardly, remove the color to make it heavier and become a cunning species

This Vietnamese riddle has the following content: "Which word, if kept small and cowardly, loses its sharpness and becomes a cunning species?". This is a seemingly simple riddle, but not everyone can find the correct answer.

If you find the answer "which word is small and cowardly, but adds more color to make it a cunning species" in the shortest time, scroll down to the comments to write it down and see how many people think the same as you.

Source: https://vtcnews.vn/tu-nao-de-nguyen-nho-be-nhat-gan-bo-sac-them-nang-thanh-loai-gian-manh-ar961697.html