give it some welly

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give it some welly

exert more effort or strength. informal
Welly or wellie , an informal abbreviation of Wellington boot , acquired an informal sense of ‘power or vigour’ in the 1970s.
1997 BBC Top Gear Magazine Drop down a gear, give it some welly and that long bonnet rises towards the horizon in the best traditions of…a traditional British Sports Car.
See also: give