1 signal

1 to count backwards (from 10 down to 0)

2 to count down

3 from the bottom (lines on a page)

4 from the back (rows of seats)

1 nickname

1 (great) majority

1 (numerical, statistical) index

2 (math.) exponent

3 index

4 exponential (function, growth)

1 one scare after another (idiom)

2 in a constant state of tension

1 lit. their number cannot be counted (idiom); fig. countless

2 innumerable

1 Destiny is inexorable, there is no fleeing it (idiom). Your doom is at hand.

1 hunger cries and cold roars (idiom); wretched poverty

1 lit. as if enumerating one's family valuables (idiom)

2 fig. to be very familiar with a matter