someone who ignores his or her companion(s) in order to gives attention to his or her mobile phone or other similar device instead. 意思是说，在社交场合注意力不集中，只自顾自地低头玩手机或其它移动设备，而忽视陪伴在你身边的人。

如果你 “get your head down（把你的头低下来）”，意思就是 “你把全部的精力集中在一项特定的任务上，全力以赴”。“Get your head down” 也可以表示 “躺下睡觉”。 例句 I need to get my head down and finish my homework – I have got so much to do. 我得全力以赴，完成作业。