Englishfor English speakers
erratic
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adjective
(= fickle, mercurial, quicksilver)
liable to sudden unpredictable change
erratic behavior
fickle weather
mercurial twists of temperament
a quicksilver character, cool and willful at one moment, utterly fragile the next
—
adjective
(= planetary, wandering)
having no fixed course
an erratic comet
his life followed a wandering course
a planetary vagabond
—
adjective
(= temperamental)
likely to perform unpredictably
erratic winds are the bane of a sailor
a temperamental motor; sometimes it would start and sometimes it wouldn't
that beautiful but temperamental instrument the flute
— Osbert Lancaster
arc
Noun
—
An arc is part of a circle.
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Electricity jumping from one place to another. This is very bright and looks like lightning.
arc
Verb
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If something arcs, it makes an electrical curve.
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If something arcs, it goes along a curved path.