視線をそらす (to avert one's gaze)

The fixed verb-object collocation 視線をそらす, literally 'to deflect one's line of sight,' meaning 'to look away, avert one's eyes.' そらす ('to turn aside, divert') governs 視線 ('gaze, line of sight'). A common way to describe the act of breaking eye contact, often charged with embarrassment, evasion, or unspoken emotion.