sit on the fence

fence in

To restrict freedom.

fence the tables

To make a solemn address to those who present themselves to commune at the Lord's Supper, on the feelings appropriate to the service, in order to hinder, so far as possible, those who are unworthy from approaching the table.

homely as a hedge fence

Having no physically attractive characteristics, but not blatantly ugly; very plain in appearance.

make a Virginia fence

To walk in a unstable manner due to being intoxicated.

mud fence

Something proverbially unattractive or ugly.

sit back

To relax, to not exert oneself.

sit in

To attend a class, educational presentation, meeting, etc. for one time, as a visitor.

sit in for

To substitute; to take somebody's place.