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countable and uncountable, plural wellies
(countable, informal) Wellington boot. quotations examples
Dad has great big welly boots. For squishing in the mud; Two great big black welly boots: Thud, thud, thud.
2009, Verse for Ages
(uncountable, informal) Force on a pedal or increase to any fuel or power for an engine or motor. examples
(uncountable, informal) Force or effort. examples
not comparable
(obsolete, UK, dialect) Almost; nearly. quotations
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, Notes & Queries, volume 8, page 64