A common flowering plant, Impatiens walleriana.

(idiomatic, chiefly US) Work or activity performed with the intention or result of occupying time, and not necessarily to accomplish something productive; routine work of low priority undertaken for the sake of avoiding idleness.

(informal) Someone who is very busy or hard-working.

I'm busy.

(simile) Very busy.

plural of busy signal

(simile, idiomatic) Very active; working constantly.

plural of fast busy signal

(mathematics, computing theory) The mathematical function that maps each positive integer n to the number of steps required for the busy beaver among machines with two colors and n states to terminate.

(telephony) An audible signal on a voice phone line that sounds more frequently than a standard busy signal, indicating that no transmission path to the called phone number is available.