expression, godan verb (-ru)
plane off the corners; bevel the edges
Used in woodworking or metalworking to remove sharp corners or create a beveled edge.
板の角を面取りして、安全に仕上げる。
Plane off the corners of the board to finish it safely.
面取り is the noun form meaning 'chamfering' or 'beveling'; 面を取る is the verb phrase.
Compound of 面 (めん, 'face' or 'surface') + を + 取る (とる, 'to take' or 'to remove'), literally 'to remove the face/corner'.