nat
n. countable C1 Advanced US //ˈnæt// nat
n. a small, biting fly that often travels in large groups. These tiny insects can be very annoying when you are outside in the summer.
n. any of various small, typically biting, two-winged flies belonging to the suborder Nematocera. Often used collectively to refer to swarms of minute dipterous insects.
Usage
Often used in the plural to describe a swarm; sometimes used metaphorically to describe something small and insignificant.