Nothing in striking description that's solid? (3-3)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

The opposite of ‘nothing in’ – and, in the description of a strike, ‘all-out’ could be defined as ‘solid’ (Chambers: ‘unanimous’ Edit: all-out is, of course, the same as nothing in – thanks, Lord Jim @6