noun, plural bul·lies.
a blustering, mean, or predatory person who, from a perceived position of relative power, intimidates, abuses, harasses, or coerces people, especially those considered unlikely to defend themselves

layground bullies targeting children with disabilities;a workplace bully who cuts me off when I speak.
Archaic. a man hired to do violence.
Obsolete. a pimp; procurer.
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verb (used with object), bul·lied, bul·ly·ing.
to act the bully toward; habitually intimidate, abuse, or harass:The boy next door constantly bullies the younger children in the neighborhood.
to coerce or compel by bullying:The salesman bullied me into upgrading the car's paint protection and rust-proofing.
verb (used without object), bul·lied, bul·ly·ing.
to act as a bully

eople who bully are often very insecure.