DOUBLE, REVERSED ACROSTIC.
A little verb used every day,
Whose letters spell the same each way;
My next, which means to lengthen out,
Spells just the same if turned about;
At close of day you'll find my third,—
Reversed, you have the self-same word;
My fourth, implying "held supreme,"
The same each way, though strange it seem.
An act, these four initials name,
Backward or forward spelled the same.
J.F.B.