1 to go online

2 to connect to the Internet

3 (of a document etc) to be uploaded to the Internet

4 (tennis, volleyball etc) to move in close to the net

1 Internet

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 (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. to catch everything in the one net (idiom)

2 fig. to scoop up the whole lot

3 to capture them all in one go

1 lit. either the fish dies or the net gets torn (idiom)

2 fig. it's a life-and-death struggle

3 it's either him or me

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.