bug
n
1 (informal) bacterium, disease, germ, infection, lurgi (informal) microorganism, virus
2 craze, fad, mania, obsession, rage
3 blemish, catch, defect, error, failing, fault, flaw, glitch, gremlin, imperfection, snarl-up (informal, chiefly Brit.) virus
vb
4 (informal) aggravate (informal) annoy, badger, be on one's back (slang) bother, disturb, gall, get in one's hair (informal) get on one's nerves (informal) get on one's wick (Brit. slang) get under one's skin (informal) get up one's nose (informal) harass, hassle (informal) irk, irritate, nark (Brit., Austral. & N.Z. slang) needle (informal) nettle, pester, piss one off (taboo slang) plague, vex
5 eavesdrop, listen in, spy, tap, wiretap