noun

• (countable, informal) Wellington boot.
  "Dad has great big welly boots. For squishing in the mud; Two great big black welly boots: Thud, thud, thud."
• (uncountable, informal) Force on a pedal or increase to any fuel or power for an engine or motor.
• (uncountable, informal) Force or effort.
  "Come on! Put some welly into it!"

adv

• (obsolete, UK, Ireland, dialect) 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."

adv

• (In representations of Chinese pronunciation) 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.""

name

• (New Zealand, informal) Wellington, New Zealand