fifth wheel

Noun fifth wheel has 3 senses

• fifth wheel(n = noun.attribute) deadwood - someone or something that is unwanted and unneeded; Array
is a kind of redundance, redundancy

• fifth wheel(n = noun.artifact) spare - an extra car wheel and tire for a four-wheel vehicle; Array
is a kind of car wheel

• fifth wheel(n = noun.artifact) Array - a steering bearing that enables the front axle of a horse-drawn wagon to rotate; Array
is a kind of bearing