1.NounA tiny freshwater fish, Poecilia reticulata, popular in home aquariums, that usually has a plain body and black or dark blue tail for the females and a more colorful tail for the males. The guppies can vary in size, but males are 4 cm (1.6”) and females are 7 cm (2.8”).
"Fred kept a tank of guppies by the windowsill."
2.NounAny tiny fish.
"Throw that one back; it’s just a guppy!"
3.NounA tube holding paintballs before they are loaded into the gun.
4.NounA hold across the palm of the hand rather than the fingertips.