OTH

On the other hand: an alternative, different perspective or possibility. Commonly used when discussing options.

The 1962 movie, "The Manchurian Candidate" was terrific; the 2004 version, on the other hand, sucked.
Because they're predicting rain tomorrow, we shouldn't plan to go out. On the other hand, their predictions are usually wrong.

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Trucker's tan

Trucker's (trucker's) tan is far more commonly used than "trucker's arm". It's used when recognizing that a person's left arm (driver's side arm) is tanner/redder than his right arm.

It's used in the same way a person would be said to have a "farmer's tan" if both his forearms were tan/red up to the point where his (short) shirt-sleeves end on the upper part of the arms.

With the ubiquity of air conditioning in cars today, "trucker's tans" are seen much less frequently. But if noticing a person's left arm is red/tan (but not the right), say, "Hey Joe, you been driving a truck? You got a 'trucker's tan', my friend!"

In the same way, upon noticing the whiteness of a friend's upper arms in contrast to their forearms, you might say, "Hey Joe! You been out farming today? You got a 'farmer's tan', my friend!"