A more thorough explanation:

QUAERENS NON INVENIT PLEGIUM

Quaerens non invenit plegium is a Latin term used in law which means "the plaintiff did not find a pledge". It refers to a sheriff's return to a writ that requires them to take security from the plaintiff for the prosecution of their claim.

For example, if a plaintiff wants to file a lawsuit, they may be required to provide a pledge or security to ensure that they will follow through with the case. If the plaintiff is unable to provide the required pledge, the sheriff may return the writ with the notation "quaerens non invenit plegium".

Another example could be a landlord who wants to evict a tenant for non-payment of rent. The landlord may be required to provide a pledge to ensure that they will not take any illegal actions during the eviction process. If the landlord is unable to provide the required pledge, the sheriff may return the writ with the notation "quaerens non invenit plegium".

These examples illustrate how the term "quaerens non invenit plegium" is used in legal situations where a pledge or security is required to ensure that a party follows through with their obligations.