The difference between Sit down and Take a pew

When used as verbs, sit down means to assume a sitting position from a standing position, whereas take a pew means to take a seat.

check bellow for the other definitions of Sit down and Take a pew

Sit down as a verb (intransitive):

To assume a sitting position from a standing position.

Examples:

"Sit down! We have work to do."
Sit down as a verb (transitive, _, or, _, reflexive):

To cause to be seated or in a sitting posture; to furnish a seat to.
Sit down as a verb (figurative):

To meet formally at a conference table.
Sit down as a verb:

To assume a low or sunken position.

Examples:

"The ball scooted off the fairway and sat down in the thick rough."

"As we all climbed aboard, the little boat sat down low in the water."