Phrase Meaning – ‘Sneak Around with Someone’ Meaning

best wishes is an idiomatic expression meaning that the person whose wishes they are desires a particular (positive) outcome for someone else; it is often used toward people who are ill (best wishes for a speedy recovery), but in this case it is used toward Napoleon (Murray wants him to win the war).

The suggested has my best wished is incorrect in both usage and grammar; has is the simple present indicative of have, indicating possession (Napoleon has something), and my best wishes (for victory) is what he has.

I feel compelled to correct my spelling after StoneyB's answer. The correct spelling is discreet, not discrete.

Discreet here means using discretion, respecting issues of privacy and decency.

Having a word with someone means having a talk with them.

Having a discreet word with someone usually means you talk to someone in private - you take them apart at the coffee corner, or you move into a meeting room. It indicates the opposite of giving someone a public telling off. It is often considered unkind to criticize someone in public, in front of their friends or colleagues. Having a discreet word with them, you make sure they do get the message,but it is not a public event.