to lower (a number) to the nearest whole number or ten, hundred, or thousand below it
Compare round up (sense 2)
Examples of 'round down' in a sentence
round down
The energy giant has paid 10m into a trust for vulnerable customers after failing to round-down bills in the way the regulator demands.
Times, Sunday Times (2013)
He told fellow board members that he wanted to round down his holding to 15,000 shares.
Times, Sunday Times (2009)
All of these figures were rounded down to nothing.
Times, Sunday Times (2007)
Today there are so few it is rounded down to zero.
The Sun (2013)
The journal points out the number of rough sleepers may be vastly underestimated - because council estimates are being rounded down to zero.
Times, Sunday Times (2007)
The association also suggests that going metric would provide an opportunity to set more sensitive speed limits, with some rounded up and others rounded down.
Times, Sunday Times (2006)
The reduction was rounded down to the nearest whole month, which meant she then underpaid her mortgage.
Times, Sunday Times (2015)
There remains a 0 per cent chance of going down (that means not literally zero but so low as to be rounded down to zero).
Times, Sunday Times (2015)
First, that probabilities near to zero, so small that they are rounded down to zero, are not the same as zero.