侧 (cè) as a verb means to incline or turn sideways, often for a body part (侧着头 tilt one's head); 斜 (xié) means slanted/oblique (a line or surface), and 倾斜 (qīngxié) means to tilt/lean (a structure). As a noun, 侧 means 'side' (右侧 right side), while 侧面 is the lateral surface or aspect, and 一旁 means 'to the side' (站在一旁 stand aside).