• (p. pr. & vb. n.) of Butter
In glazing, application of sealant or compound to the flat surface of some member before placing the member in position, such as the buttering of a removable stop before fastening the stop in place. 
In glazing, application of sealant or compound to the flat surface of some member before placing the member in position, such as the buttering of a removable stop before fastening the stop in place.
Placing mortar on a masonry unit with a trowel.
Place mortar on a masonry unit with a trowel
Placing mortar on stone on stone tile units with a trowel before setting into position, to insure adhesion and to aid in leveling.
Smearing skis along the snow in a fashion similar to buttering a piece of bread. Common technique for powder skiing with fat, rockered skis. See also smearing.
Placing mortar on stone with a trowel before setting into place.