rotten apple  spoil  the (whole)  barrel
<abbr style="text-decoration: underline;" title="rotten / bad" > rotten</abbr>
rɒtən
rotēn
apple
æpəl
āpēl
spoil
spɔɪl
spoyl
the
ðə
dhē
(whole)
həʊl
hewl
<abbr style="text-decoration: underline;" title="barrel / bushel / bunch" > barrel </abbr>
bærəl
bārēl

Definition & Meaning of "rotten apple spoil the (whole) barrel "in English

rotten apple spoil the (whole) barrel
01

used to imply that a single bad or negative element within a group can have a harmful or corrupting influence on the entire group, leading to a decline in overall quality or integrity 

Dialectamerican flagAmerican
Proverb

What is the origin of the proverb "a rotten apple spoils the barrel" and when to use it?

The origin of the proverb "a rotten apple spoils the barrel" is rooted in traditional agricultural wisdom and has been used in European cultures since at least the 17th century. It highlights how a single person’s poor behavior or decisions can have a harmful impact on a larger community or system, suggesting the importance of addressing issues before they can spread and cause widespread damage. The proverb serves as a reminder of the need to be watchful and the potential consequences of allowing negative elements to remain within any group or environment.

Examples
Bosses need to be wary of hiring or keeping unsuitable employees, for as the proverb states, a rotten apple spoil the barrel. 
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