Regarding or concerning.
Of an appropriate or pertinent nature.
by the way, incidental
To the purpose; appropriately.
By the way.
Timely; at a good time.
Unsuitable to the rank or dignity of; beneath.
Downstage of.
Lower in spatial position than.
Lower than in value, price, rank, concentration, etc.
South of.
Downstream of.
On or to a lower deck, especially as relative to the main deck.
On or to a lower storey.
Later in the same text.
In or to a lower place.
Below zero.