(idiomatic) Fighting for or supporting that which is good, just, or benevolent.

(horsemanship) The left-hand side of a horse.

on the other hand; conversely

(education) An educator whose method is to provide students with occasional advice, assistance, and correction while allowing them to explore a subject area independently or by interacting among themselves; this educational method itself.

Having six sides.

plural of side wall

Taking precautions.

The right side of an altar or church to a person looking from the nave toward the chancel.

(dialectal) side by side

Beyond (a specified age); older than.