商売敵は仲が悪い。の英語

Two of a trade seldom agree.

My enemy's enemy is my friend.

The enemy of my enemy is my friend.

The tide of war is against the enemy.

One can not deceive a professional eye

The blemish can not escape a trained eye.

I have to deal with a notorious scoundrel.

We have to deal with a notorious scoundrel.

His performance would put the professional to the blush.

The performance would shame a professional―do credit to a professional.

The business is not doing very well.

We have no common enemy to deal with.

a worthy rival

It is in the nature of his business.

Dishonest merchants profiteer.

Dishonest merchants make excessive profits―（当世の言葉では）―profiteer

I have nothing to do with him in the way of business.

He should have known better than to give up his business.

a worthy rival

The business is slow.

You committed a blunder in giving up your business.

This business does not go well―do well―at the best of times.

The business is in the red.

How's business?

an awkward customer

My competitor was running me hard―running me close.

I don't know the ABC of business.

the characteristics of a trader

My business is doing well.

They are two of a trade.