The phrase "lethal partnership" refers to a dangerous and potentially deadly alliance or collaboration between two or more individuals or entities. It suggests that the partnership has the potential to cause harm or even be fatal. Full definition
Together with Danny - boy, he can form an absolutely lethal partnership, because Danny runs great lines and Mezut can read them like no - one else. (justarsenal.com)
Mancini's policy on youth is also another thing to add, it was reported earlier this week that he shouted at Kovacic for playing it short rather than going on a run, with both the Croat and Icardi they have a potentially lethal partnership and it will be interesting to see how Mancini uses this. (italianfootballdaily.com)
Arnautovic's movement and attacking style has the ability to unsettle any defence, coupled with his lethal partnership along with Bojan Krkić in alignment with Shaqiri, which have produced goals for Stoke City in the current campaign. (justarsenal.com)