welly /ˈwɛli/noun 3adverb 2forms 1phrases 2 noun3 •(informal) A Wellington boot.Dad has great big welly boots. For squishing in the mud; Two great big black welly boots: Thud, thud, thud. — 2009 •(informal) Force on a pedal or increase to any fuel or power for an engine or motor. •(informal) Force or effort.Come on! Put some welly into it! adverb2 •Very.The real thrill comes to the investigator when, convinced that he is no mere casual diner, the waiter grins broadly and says, "You don't worry. I get you something welly nice." — 1928 •(dialect, no longer used) Almost; nearly.A person exceedingly hungry says, "I'm welly clem'd; I'm almost or well-nigh starved." It is the ordinary appeal of a beggar in the streets, when asking for food. — 1853 formswellies Phrases with welly give it some wellyTo increase fuel or power to an engine, as to a car by depressing the gas pedal. welly itTo apply maximum force, energy, or acceleration to something.