lurk: implies a lying in wait in a place of concealment and often suggests an evil intent: suspicious men ~ing in alleyways.  小巷胡同窄道走廊


skulk: suggests furtive movement and cowardice or fear or sinister intent: spied something ~ing in the shadows.  （furtive偷偷小心implies a sly or cautious stealthiness，如exchanged furtive smiles across the room在房间两侧向对方偷偷微笑。其中stealthy本身表示竭力不被发现suggests taking pains to avoid being seen or heard，如the stealthy movements of a cat burglar飞贼的偷偷摸摸的动作，如歼20属于隐形战机stealthy fighter。underhanded表示秘密并且有欺诈implies fraudulent intent，如a car dealership guilty of underhanded practices汽车行的欺诈行为，这几个词在2018-05-31 秘密secret-underhanded组中，secret泛指秘密，可出于任何原因，如a secret meeting秘密会议） （sinister阴险applies to what threatens by appearance or reputation, and suggests a general or vague feeling of fear or apprehension on the part of the observer给人威胁的感觉，让人隐隐害怕担心，如a sinister aura surrounded the place那个地方围绕着阴险的气氛）



slink: implies a stealthiness in moving to escape attention and may connote sly caution: during the festivities, I ~ away. (过去式i变u)  sly诡秘狡猾，做事不让人知道，常形容狐狸a sly fox，或做事情隐蔽小心的人


sneak: may add an implication of entering or leaving a place or evading a difficulty by furtive, indirect, or underhanded method: he
~ed out after the others had fallen asleep.   如a sneak thief顺手牵羊的小偷，如don't trust that sneak别相信那个家伙，让人讨厌的人，如sneak an apple from a shop从商店里偷了个苹果，平底运动鞋是sneaker


lurk潜伏: 指潜藏躲卧在某地，伺机行恶，skulk偷摸: 表示胆怯、偷偷动作，目的阴险，slink隐蔽行动: 指行动隐蔽暗示做事谨慎，sneak溜、偷、软鞋底:  还表示偷偷溜进溜出某地或躲避问题，方法隐蔽间接或欺诈


记忆方法: 1）首字母LSSS事事顺利<==偷摸    

         2）偷摸的意思是秘密动作躲避注意mean to behave furtively so as to escape attention.