low, lo

Low or low means situated close to a floor, the ground, or the bottom of something, literally or figuratively--
It is on the low shelf in the living room.
There is a low wall around the garden.
The sun was low in the sky when they returned.
This price seems low, but I'm not sure what it usually costs.
"Buy low, sell high."
He has been feeling low since she dumped him.
They all seem to be in low spirits.

Lo or lo ( rhymes with low ) is an interjection ( an exclamation, like hey! or oh! ), meaning "look!", or "look at that!"--
I looked all over for my keys, when lo and behold, they were in my hand all along.
"And lo, the angel of the Lord came upon them... and they were sore afraid."

Now that you know that, you can say--
"We looked everywhere, high and low, when lo and behold, it was right in front of us."

Note--"low" also means vocalizing, of a cow or cattle--
You can hear the cattle low from the other side of the hill.
"Low", meaning cattle making a sound, is a verb ( action word)--
It lows; it is still lowing; it lowed yesterday, too.
"The cattle are lowing the poor baby wakes..."
Note # 2--"Low" also means coarse, vulgar, or disreputable--
He has low taste in entertainment.
Note # 3--"lower" may describe something that is closer to the ground or bottom--
The price on this model is lower.
"Lower" may also mean to move something closer to the ground or bottom--
We will lower that price during our next sale.
"Lower", meaning to reduce something, or move it closer to the bottom or ground, is a verb ( action word )--
He lowers the prices every Friday.
Lower the blinds.
We are lowering all of the prices.