| ever-busy(adjective, activity, business, task, affair) |
| exchange busy hour(expression, activity, business, task, affair) |
| executive busy override(expression, activity, business, task, affair) |
| facility busy(expression, activity, business, task, affair) |
| facility busy indication(expression, activity, business, task, affair) |
| feature call forward busy line(expression, activity, business, task, affair) |
| forwarding on busy(expression, activity, business, task, affair) |
| frantically busy(expression, activity, business, task, affair) |
| fusion furnace(expression, activity, business, task, affair) |
| get a busy signal(expression, activity, business, task, affair) |
| group-busy tone(expression, activity, business, task, affair) |
| group busy lamp(expression, activity, business, task, affair) |
| group make busy(expression, activity, business, task, affair) |
| have a lot of busy work to do(expression, activity, business, task, affair) |
| he is too busy(expression, activity, business, task, affair) |
| hunt make-busy feature(expression, activity, business, task, affair) |
| hunt make busy feature(expression, activity, business, task, affair) |
| i'm too busy(expression, activity, business, task, affair) |
| if busy or no reply(expression, activity, business, task, affair) |
| initial busy period(expression, activity, business, task, affair) |