The word busy is an idiom.

Idiom with the word "busy": in a hurry; Hurry, hurry, hurry, hurry, hurry.

Idioms describing "busy" are: diligent practice, busy scheduling, day and night, overwhelmed, sleepless nights, busy as a bee, exhausted, overworked, burned to ashes, sleepless nights, hands and feet, overwhelmed, full of enthusiasm, and endless arguments.