A type of small, parasitic insect that infests rats and other rodents.

An analogy for something that is bothersome or troublesome, similar to an annoying insect.

परेशान करने वाला

English Usage: His constant nagging felt like a rat flea, always biting at my patience.

Hindi Usage: उसकी लगातार शिकायतें मुझे चूहे के पिस्सू की तरह परेशान कर रही थीं।